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(1)

Electrical Safety &

Electrical Safety &

Accident Prevention

Accident Prevention

1 1

(2)

Accidents

Accidents

An Accident is An Accident is

An unexpected, unplanned, undesired event An unexpected, unplanned, undesired event

or a sequence of a events. or a sequence of a events. that occurs through

that occurs through

a combination of causes a combination of causes

which results in physical harm which results in physical harm ( injury, disease, death)

( injury, disease, death)

to individual, damage to property to individual, damage to property & interruption in completion of an & interruption in completion of an activity or any combination of these activity or any combination of these effects.

effects.

2 2

(3)

The causes for occurrence of 

The causes for occurrence of 

Electrical Accidents

Electrical Accidents

1)

1) Non observation of Non observation of safesafety precautionsty precautions

2)

2) Sub-standard method of construction of lines.Sub-standard method of construction of lines.

3)

3) Sub-standard materials utilized.Sub-standard materials utilized.

4)

4) Improper maintenanceImproper maintenance

5)

5) Improper authorizationImproper authorization

6)

6) IneffIneffective supervision ective supervision at various levelsat various levels

7)

7)

Ineffective earthingIneffective earthing

8)

8) Unguarded live lines passing through close proximity of Unguarded live lines passing through close proximity of 

telecom lines & densely populated areas

telecom lines & densely populated areas

9)

9) Ignorance of rules & Ignorance of rules & regulationsregulations

10) 10) NegligenceNegligence 11) 11) OverconfidenceOverconfidence 12) 12) CarelessnessCarelessness 33

(4)

Remedial measures suggested

Remedial measures suggested

1)

1) Training to line staff Training to line staff  2)

2) Providing ample quantity of safety equipmentsProviding ample quantity of safety equipments

3)

3) Issuing instruction of “safIssuing instruction of “safety of working on ety of working on line” to line staff & making themline” to line staff & making them

aware of importance of following the

aware of importance of following the samesame

4)

4) Providing Providing sufficient quantisufficient quantity of maintenance mty of maintenance material to unit ofaterial to unit officesfices

5)

5) Displaying “siDisplaying “single line diagrams of line ngle line diagrams of line feeders network” on walls of S/Sfeeders network” on walls of S/S

(including latest changes in feeding if any)

(including latest changes in feeding if any)

6)

6) Replacement of deteriorated poor earthingReplacement of deteriorated poor earthing

7)

7) Carrying out pre monsoon/ Carrying out pre monsoon/ post monsoon maintenance well in advancepost monsoon maintenance well in advance

8)

8) Compelling line sCompelling line staff & developing habtaff & developing habit in them it in them to discharge lines to discharge lines at workat work

spot before climbing on it

spot before climbing on it

In other words not to work on

In other words not to work on lines without discharging it (even if permit islines without discharging it (even if permit is

taken, load shedding persists are line is really dead)

taken, load shedding persists are line is really dead) because they should bebecause they should be

aware that line may get charged due to any of the

aware that line may get charged due to any of the reason such as fault inreason such as fault in

switch gear/ line, someone may charge the line by

switch gear/ line, someone may charge the line by oversight, back foversight, back feeding,eeding,

induction etc. & the discharge rod should remain installed on both sides of 

induction etc. & the discharge rod should remain installed on both sides of 

work spot till the completion of work.

work spot till the completion of work. ALM/LM or any other supervisorALM/LM or any other supervisor

should restrict LH to work

should restrict LH to work on line without don line without discharging it. Should insist to keepischarging it. Should insist to keep

line

(5)

Remedial measures suggested

Remedial measures suggested

9)

9)

Providing

Providing

anti

anti

climbing

climbing

devices,

devices,

danger

danger

boards to poles/ structures etc.

boards to poles/ structures etc.

10) Restricting public to construct

10) Restricting public to construct

building

building

below or in vicinity of lines

below or in vicinity of lines

11) Check on theft of energy. Unauthorized

11) Check on theft of energy. Unauthorized

substandard extension

substandard extension

12) Electricity is invisible & do not speak; we

12) Electricity is invisible & do not speak; we

should be alert about its existence. Confirm by

should be alert about its existence. Confirm by

discharge rods before touching it.

discharge rods before touching it.

5

(6)

Safety Slogans

Safety Slogans

:-1.

1.

Be safet

Be safet

y minded

y minded

2. No holiday for safety

2. No holiday for safety

3.

3.

If it seems risky, don’t do it.

If it seems risky, don’t do it.

4.

4.

Always

Always

be

be

alert, A

alert, A

void

void

accidents.

accidents.

5. Safety requires careful working.

5. Safety requires careful working.

6. Time is important but safety is far more important.

6. Time is important but safety is far more important.

7. “Always be careful” is the ABC of safety.

7. “Always be careful” is the ABC of safety.

(7)

8. Follow the procedure of safety.

8. Follow the procedure of safety.

9. Little care makes mishaps rare.

9. Little care makes mishaps rare.

10. Do not think it is safe make

10. Do not think it is safe make

it sure.

it sure.

1

1

1.

1.

Accident begin

Accident begin

where safety

where safety

ends.

ends.

12.

12.

Guard against risk and work for safety.

Guard against risk and work for safety.

13. Eliminate all shortcuts, while on duty

13. Eliminate all shortcuts, while on duty

14. Where vigilance ends accident begin.

14. Where vigilance ends accident begin.

15. Don’t trust luck, trust to safety.

(8)

16.

16.

If a job is too big

If a job is too big for you, get help don’t get hurt.

for you, get help don’t get hurt.

17. Never feel sure that you are

17. Never feel sure that you are

safe.

safe.

18. Jokes begun in fun can end in tragedy.

18. Jokes begun in fun can end in tragedy.

19. Life is short and precious don’t make

19. Life is short and precious don’t make

it

it

shorter by carelessness.

shorter by carelessness.

20. Do not take chances with your life follow

20. Do not take chances with your life follow

safety

safety

rules meticulously

rules meticulously

 Above slogans are the k

(9)

Safety Norms in an EHV S/Stn

Safety Norms in an EHV S/Stn

.

.

1)

1) Presently Presently there is there is no codino codified norms fied norms prescribed prescribed for safety for safety inin

EHV S/Stn. however some norms are in circular or

EHV S/Stn. however some norms are in circular or letter form.letter form.

2)

2) FollFollowinowing are the proposg are the proposed safeted safety norms bay norms based on 37 yeased on 37 yearsrs

experience.

experience.

i)

i) In In ExExtrtra oa ordrdininarary y cocondndititioionn a)

a) Like Like earth earth quakquake, lae, land snd slide lide & s& sinkiinking of ng of landland, , in sin suchuch

conditions precaution to be taken in adopting safe building

conditions precaution to be taken in adopting safe building

technology and precaution for power

technology and precaution for power transformer installatitransformer installationon

like pro

like providing tempoviding temporary breakrary breaks to s to transformer wtransformer wheels & heels & soilsoil

treatment etc.

treatment etc.

b)

b) StormStorms, Fls, Floods aoods and othnd other nater natural cural calamalamitesites

c)

c) TTerrorerrorist attist attack & Wack & War condar conditioitionn

d)

d) PublPublic aic and Snd Staftaff af agitagitationtion

9 9

(10)

ii) In ordinary condition

ii) In ordinary condition a)

a) EHV EHV S/Stn S/Stn is is a pra prohibohibited ited area.area.

b)

b) The area The area shall be shall be well fencwell fenced and ed and properly loproperly locked and cked and entry of entry of 

outside person and animal prohibited for any purpose.

outside person and animal prohibited for any purpose.

c)

c) PropProper wer watch atch and and ward ward shalshall be l be keptkept..

d)

d) The S/SThe S/Stn. shatn. shall be consll be constructtructed mained maintaintained and operaed and operated asted as

per I.E. act rules and other

per I.E. act rules and other statutory acts and regulationsstatutory acts and regulations

applicable.

applicable.

e)

e) Earthing Earthing is a is a heart of heart of electricielectricity to aty to avoid any void any damage to damage to humanhuman

life and equipment and shall be provided as per I.S. 3043 and

life and equipment and shall be provided as per I.S. 3043 and

maintained so that touch potential and step potential and earth

maintained so that touch potential and step potential and earth

fault loop impedance remains within permissible limit.

fault loop impedance remains within permissible limit.

10 10

(11)

f) All structures, equipment, shall be installed, maintained and

f) All structures, equipment, shall be installed, maintained and

operated as per I.E. act and

operated as per I.E. act and concerned rule, methods of concerned rule, methods of 

constructions and practices according to it and all equipments

constructions and practices according to it and all equipments

and structures shall be as per concerned I.S. standard and

and structures shall be as per concerned I.S. standard and duedue

attention shall be given to the maintenance schedule prepared

attention shall be given to the maintenance schedule prepared

by department for each item also the

by department for each item also the maintenancemaintenance

Recommendations of the manufacture shall be given due

Recommendations of the manufacture shall be given due

weightage to avoid equipment failure, fires and break downs.

weightage to avoid equipment failure, fires and break downs.

Some important items are given below.

Some important items are given below.

1. Precaution for power T/F

1. Precaution for power T/F replacementreplacement, installation and, installation and

handling.

handling.

2. Regarding battery.

2. Regarding battery.

3. Bursting

3. Bursting of CTof CT, , PT PT and LAand LA

4. Crushed Stone and grown up grass in switch yard.

4. Crushed Stone and grown up grass in switch yard.

5. Monkey troubles.

(12)

g) Fires :- Causes of Fires

g) Fires :- Causes of Fires

1. Sparking in S/Stn. due to loose contact.

1. Sparking in S/Stn. due to loose contact.

2. Fire due

2. Fire due to Tto Transformransformer failure CT er failure CT PT PT & catching of & catching of fire byfire by

oil mainly due to failure of bushings.

oil mainly due to failure of bushings.

3. Precaution to be taken in

3. Precaution to be taken in this regard.this regard.

4. Dry grass in

4. Dry grass in S/Stn. area.S/Stn. area.

5. Cable faults.

5. Cable faults.

6. Burning of Control cable

6. Burning of Control cable due to increase in ground due to increase in ground potentialpotential

rise due to tripping.

rise due to tripping.

7. Flash over in Indoor

(13)

h) Precautionary measures.

h) Precautionary measures.

1. Every power T/F shall be provided with fire

1. Every power T/F shall be provided with fire protectionprotection

scheme and oils sockpit shall be provided with proper drainage

scheme and oils sockpit shall be provided with proper drainage

arrangement

arrangement

2. Providing and installing fire fighting equipment in complete

2. Providing and installing fire fighting equipment in complete

S/Stn. area as per the

S/Stn. area as per the norms provided by fire officer of thenorms provided by fire officer of the

department and staff shall be well trained in handling fire

department and staff shall be well trained in handling fire

situation and regular drill shall be taken

situation and regular drill shall be taken every year the fireevery year the fire

protection equipme

protection equipment shall be nt shall be tested and refilling done.tested and refilling done.

3. Fire alarm and

3. Fire alarm and siren shall be provided.siren shall be provided.

4. Safety instruction shall be display in this regard at important

4. Safety instruction shall be display in this regard at important

locations.

locations.

I) To carry out safety audit regularly

I) To carry out safety audit regularly

 j) Storing of ma

 j) Storing of material and housterial and house kipping of S/Se kipping of S/Stn. shall be vtn. shall be veryery

clean and suitable for free moments and gating

clean and suitable for free moments and gating required thingsrequired things

very easily whenever required.

very easily whenever required.

k) Illumination :- The illumination intensity shall be measured and

k) Illumination :- The illumination intensity shall be measured and

monitored regularly

(14)

l) All precautions shall be taken to avoid theft.

l) All precautions shall be taken to avoid theft.

m) Rains and control room leakages and there effects and other 

m) Rains and control room leakages and there effects and other 

seasonal precautions.

seasonal precautions.

n) Communication

n) Communication

o) In every S/Stn. logging of every instance shall be there and

o) In every S/Stn. logging of every instance shall be there and

event recorder installed.

(15)

Safety T & P

Safety T & P

Earthing & Discharge Rods.

Earthing & Discharge Rods.

Ladders, safety belts.

Ladders, safety belts.

Operating Rods

Operating Rods

Hand gloves

Hand gloves

 –

 –

insulated.

insulated.

Insulated pliers, Neon

Insulated pliers, Neon

tester

tester

s.

s.

Insulated Platform, rubber mats

Insulated Platform, rubber mats

15

(16)

Discharge Rods

Discharge Rods

• 5 to 6 m long5 to 6 m long

• Earthing wire to be connected to an effective earth first & thenEarthing wire to be connected to an effective earth first & then the rod to be hooked to conductor.

the rod to be hooked to conductor.

• While removing, reverse sequence to be followed.While removing, reverse sequence to be followed.

16

(17)

Insulated hand gloves

Insulated hand gloves

To be invariably used where accidental contact of 

To be invariably used where accidental contact of 

operating person with live parts is likely i.e.

operating person with live parts is likely i.e.

when

when

(i)

(i)

operating

operating

G.O.D.,

G.O.D.,

D.O.

D.O.

sets

sets

(ii)

(ii)

Opening

Opening

/closing

/closing

isolator

isolator

s.

s.

(iii)

(iii)

W

W

orking

orking

near

near

live

live

lines

lines

Should withstand 10 KV for one minute.

Should withstand 10 KV for one minute.

Gloves with leakage current of more than

Gloves with leakage current of more than

10 milliamps to be rejected.

10 milliamps to be rejected.

17

(18)

Maintenance of hand gloves

Maintenance of hand gloves

Should be carried in

Should be carried in

canv

canv

as/leather bag.

as/leather bag.

Should be stored in dry container with no sharp

Should be stored in dry container with no sharp

edges. If stored & not used for more than six

edges. If stored & not used for more than six

months testing to be done

months testing to be done

Not be exposed

Not be exposed

to extreme heat or cold.

to extreme heat or cold.

Oil is the enemy of gloves.

Oil is the enemy of gloves.

Not to be soiled with oil, tar, paint etc.

Not to be soiled with oil, tar, paint etc.

Should be free from cuts, scratches, holes.

Should be free from cuts, scratches, holes.

18

(19)

The points which are neglected for

The points which are neglected for accidents likely to takeaccidents likely to take

place

place

1) In this regard the Indian electricity rules : 1956 rule 42

1) In this regard the Indian electricity rules : 1956 rule 42

says

says..

The owners of all circuits and

The owners of all circuits and apparatus shall so arrangeapparatus shall so arrange

them that there shall be no danger of any part thereof 

them that there shall be no danger of any part thereof 

becoming accidentally charged to any voltage beyond the limits

becoming accidentally charged to any voltage beyond the limits

by voltage for which they are

by voltage for which they are intended.intended.

2

2)) Responsibility of Individual Employees:-Responsibility of Individual

Employees:-The responsibility of Individuals is to act so as to provided.

The responsibility of Individuals is to act so as to provided.

i) Safety to Self.

i) Safety to Self.

ii) Safety to fellow employees.

ii) Safety to fellow employees.

iii) Protection to the public.

iii) Protection to the public.

iv) Protection to

(20)

3) Responsibility of Supervisors

3) Responsibility of Supervisors :-Superviso

Supervisors have rs have the definite responsibility of ensuring the definite responsibility of ensuring thethe

following

following

i) Safe working conditions.

i) Safe working conditions.

ii) Necessary protective equipment and its use.

ii) Necessary protective equipment and its use.

iii) Properly maintained tools and

iii) Properly maintained tools and equipment.equipment.

iv) Properly planned work performed in a safe manner.

iv) Properly planned work performed in a safe manner.

v) Application of the general & special safety instructions by

v) Application of the general & special safety instructions by

their workmen.

their workmen.

vi) Assignment of employees to jobs which they are capable of 

vi) Assignment of employees to jobs which they are capable of 

doing

doing safetysafety..

vii) Immediate steps to correct any violation of safety rules

(21)

4) Each Supervisor shall make certain that his men

4) Each Supervisor shall make certain that his men

understand the following

understand the following :-i) Work to be done.

i) Work to be done.

ii) Hazards that may be encountered.

ii) Hazards that may be encountered.

iii) Proper procedure for doing the work safety.

iii) Proper procedure for doing the work safety.

5) Frequent periodic inspections of construction, operation

5) Frequent periodic inspections of construction, operation

and maintenance of equipments, materials, work areas,

and maintenance of equipments, materials, work areas,

conditions and methods should be made by

conditions and methods should be made by supervisorssupervisors

as a part of their routine duty. Such inspections are

as a part of their routine duty. Such inspections are

essential to prevent

essential to prevent fires and Accidents.fires and Accidents.

6) The rout cause of types of

6) The rout cause of types of accident likely to take place inaccident likely to take place in

EHV S/S and on EHV lines in

EHV S/S and on EHV lines in negligence to the abovenegligence to the above

point.

(22)

Types of accidents.

Types of accidents.

A)

A) EHEHV S/SV S/Stn. :tn. :- -i)

i) FlaFlash osh over ver durduring ing worworkiking ong on in indondoor por paneanels.ls.

ii)

ii) ImprImproper usoper use of die of dischascharge rods rge rods and wrand wrong opong operatierations anons andd

failure of tools.

failure of tools.

iii)

iii) Bursting Bursting of CT of CT PT PT and falland falling hot ing hot oil on oil on supervisosupervisor or per or person.rson.

iv)

iv) Falling from hFalling from height due to non ueight due to non use of safety dse of safety devices.evices.

v)

v) AccAccididentental cal charhargingingg

vi)

vi) Bursting of LA Bursting of LA and injuring the persons in swiand injuring the persons in switch yard.tch yard.

vii) Due to non

vii) Due to non checking of soil for unloading power T/F andchecking of soil for unloading power T/F and

careless working

(23)

B) Lines

B) Lines :-i

i)) ImImpproropper er cclleeararanancceses

ii)

ii) WWorkorking ing on on wrowrong cng circircuiuitt

iii)

iii) not not following following safety safety instructionsinstructions

iv)

iv) failfailure of ure of tooltoolss

v)

v) WhiWhile ele excaxcavativation duon due to e to blasblastingting

vi)

vi) during line conduring line construction such struction such as tower errectioas tower errection stringing andn stringing and

crossing of roads etc.

crossing of roads etc.

vii) During transport.

vii) During transport.

23 23

(24)

Authorisation

Authorisation

• For being eligible to apply for & obtain permit, the employeeFor being eligible to apply for & obtain permit, the employee must be `authorized

must be `authorized’’ by theby the `competent’`competent’ authority.authority.

• Person issuing permit is `competentPerson issuing permit is `competent’’ person (E.E. or in chargeperson (E.E. or in charge operator)

operator)

• Person receiving permit isPerson receiving permit is `authorized’`authorized’ person.person.

24

(25)

Authorisation

Authorisation

Under Section 3, Sub-rule (3) of I.E. Rules 1956.

Under Section 3, Sub-rule (3) of I.E. Rules 1956.

“No

“No

person shall be deemed to be

person shall be deemed to be

`authorized’

`authorized’

unless his name has been entered in

unless his name has been entered in

`authorization list

`authorization list

maintained at the office of 

maintained at the office of 

the person authorizing him.

the person authorizing him.

Purpose of authorization to be mentioned. Entry

Purpose of authorization to be mentioned. Entry

in the list to be attested by

in the list to be attested by

`authorizing’

`authorizing’

&

&

authorized persons.

authorized persons.

25

(26)

Authorisation List 

Authorisation List 

To be produced before Electrical Inspector

To be produced before Electrical Inspector

whenever required.

whenever required.

Inspector may amend / cancel authorisation.

Inspector may amend / cancel authorisation.

To be exhibited in Sub-stations/Distribution

To be exhibited in Sub-stations/Distribution

Centres.

Centres.

Will clearly state the area of authorisation (I.e.

Will clearly state the area of authorisation (I.e.

name of S/S, names of lines etc.)

(27)

Authorisation List 

Authorisation List 

• Will clearly state the area of authorization (i.e. name of S/S,Will clearly state the area of authorization (i.e. name of S/S, names of lines etc.)

names of lines etc.)

• To be maintained in the office of S.E. (O&M) E.E. (O&M) of To be maintained in the office of S.E. (O&M) E.E. (O&M) of  area.

area.

• To include names of testing staff given by E. E. (Testing)To include names of testing staff given by E. E. (Testing)

27

(28)

Authorization

Authorization

• As per I.E. rules 1956, section 36, As per I.E. rules 1956, section 36, sub section (2)sub section (2)

No person shall work on any electric line or apparatus and no No person shall work on any electric line or apparatus and no person shall assist such person unless authorized to carry out person shall assist such person unless authorized to carry out that work.

that work.

28

(29)

Line clear Permit 

Line clear Permit 

• Authorized person should apply for issue of permit toAuthorized person should apply for issue of permit to competent person on the back side of O/C of permit.

competent person on the back side of O/C of permit.

• Issuer of permit to cut off juice to the equipment/line,Issuer of permit to cut off juice to the equipment/line, discharge and earth it before issue of permit.

discharge and earth it before issue of permit.

29

(30)

Permit taken on phone

Permit taken on phone

`Taker’

`Taker’

of permit to clearly state his name,

of permit to clearly state his name,

designation, equipment/line on which permit

designation, equipment/line on which permit

needed and purpose.

needed and purpose.

`Issuer’

`Issuer’

to note down the above in a specially

to note down the above in a specially

maintained permit book, give code word &

maintained permit book, give code word &

number & record it.

number & record it.

`Taker’

`Taker’

to repeat the above and give his code

to repeat the above and give his code

word & number to issuer.

word & number to issuer.

30

(31)

Permit on phone

Permit on phone

While returning the permit, the

While returning the permit, the

`taker’

`taker’

to state

to state

the code word/number given by

the code word/number given by

`issuer’,

`issuer’,

confirm

confirm

removal of earth and men from the line.

removal of earth and men from the line.

Permit taken in person can be returned on

Permit taken in person can be returned on

phone.

phone.

Duplicate copy of permit to be sent by post by

Duplicate copy of permit to be sent by post by

`issuer’

`issuer’

to

to

`taker’

`taker’

of permit subsequently after

of permit subsequently after

cancelling it.

cancelling it.

31

(32)

Self Permit 

Self Permit 

Here,

Here,

`issuer’

`issuer’

& taker of permit is one & the

& taker of permit is one & the

same. (when only one authorized person is

same. (when only one authorized person is

available).

available).

He should isolate, discharge, earth the

He should isolate, discharge, earth the

equipment/line, hang `men working on line, Do

equipment/line, hang `men working on line, Do

not

not

charge’

charge’

board on switch, take written permit

board on switch, take written permit

after clear logging & then work.

after clear logging & then work.

32

(33)

Logging of Permit 

Logging of Permit 

All operations done before & after issue of 

All operations done before & after issue of 

permit to be logged. Also those done by remote

permit to be logged. Also those done by remote

end to be logged.

end to be logged.

Issuer of permit

Issuer of permit

may change after end of shift.

may change after end of shift.

Outgoing operator to clearly inform in writing &

Outgoing operator to clearly inform in writing &

orally about pending permits.

orally about pending permits.

Though

Though

`issuer’

`issuer’

may change,

may change,

`taker’

`taker’

should

should

himself return permit.

himself return permit.

33

(34)

Precautions by Issuer

Precautions by Issuer

Limits of line clear permit area to be

Limits of line clear permit area to be

clearly mentioned in the permit and

clearly mentioned in the permit and

told orally to the Receiver of permit

told orally to the Receiver of permit

e.g.

e.g.

:-`Isolator is live on the other

`Isolator is live on the other

side’

side’

in

in

the

the

feeder b

feeder b

ay

ay

.

.

34

(35)

Precautions by Issuer

Precautions by Issuer

H.T. feeder

H.T. feeder

 –

 –

Radial

Radial

Open controlling circuit breaker & open isolators

Open controlling circuit breaker & open isolators

on both sides.

on both sides.

Close earth switch if isolator `with E.B.

Close earth switch if isolator `with E.B.

provided

provided

& mention in the permit.

& mention in the permit.

If earth switch non-existent, provide discharge &

If earth switch non-existent, provide discharge &

earthing rods.

earthing rods.

35

(36)

Precautions by Issuer

Precautions by Issuer

H.T. feeder fed from both sides

H.T. feeder fed from both sides

Obtain permit from the other end.

Obtain permit from the other end.

Inform

Inform

earthing

earthing

position

position

of 

of 

sending end & note down position

sending end & note down position

at other end.

at other end.

36

(37)

Precautions by Permit holder

Precautions by Permit holder

on H.T. lines.

on H.T. lines.

Discharge

Discharge

& ea

& ea

rth

rth

each

each

conductor

conductor

.

.

Retain earthing in firm condition

Retain earthing in firm condition

on either side of the work

on either side of the work

location.

location.

37

(38)

Precautions by Permit holder

Precautions by Permit holder

On one of the circuits when other circuit is live on

On one of the circuits when other circuit is live on

H.T. D/C line.

H.T. D/C line.

Only works of minor nature such as renewing

Only works of minor nature such as renewing

insulator binding etc. to be done.

insulator binding etc. to be done.

Safety belt, rope to be used.

Safety belt, rope to be used.

Minimum distance of 1050 mm to be maintained

Minimum distance of 1050 mm to be maintained

from live circuit.

from live circuit.

(39)

Earthing

Earthing

definition

definition

Connecting the portion of an

Connecting the portion of an

equipment, support structure,

equipment, support structure,

enclosure associated with an

enclosure associated with an

electric system to General mass of 

electric system to General mass of 

earth.

earth.

39

(40)

Purpose of earthing

Purpose of earthing

Safety of human beings / animals

Safety of human beings / animals

coming in or likely to come in

coming in or likely to come in

contact with electrical installation.

contact with electrical installation.

Proper/desired operation of 

Proper/desired operation of 

`System’

`System’

40

(41)

Safety earthing

Safety earthing

• Metal enclosures of C.B.s, C.T.s, PTs, tanks of PowerMetal enclosures of C.B.s, C.T.s, PTs, tanks of Power transformers, support towers, poles, stays, operating handles transformers, support towers, poles, stays, operating handles of isolators, A. B. Switches, feeder pillars etc. which are of isolators, A. B. Switches, feeder pillars etc. which are desired to be at earth potential, are earthed

desired to be at earth potential, are earthed

.

.

41

(42)

System Earthing

System Earthing

Neutrals of star connected windings of power

Neutrals of star connected windings of power

transformers solidly connected to earth for

transformers solidly connected to earth for

speedy isolation of earth fault & avoiding

speedy isolation of earth fault & avoiding

`oscillating

`oscillating

neutral’

neutral’

.

.

Thus, lower phase voltage in loaded phase and

Thus, lower phase voltage in loaded phase and

high voltage in lightly loaded phases avoided.

high voltage in lightly loaded phases avoided.

Otherwise voltage of healthy phases of 

Otherwise voltage of healthy phases of 

transf

transf

ormers rise

ormers rise

leading to insulation

leading to insulation

failur

failur

e.

e.

42

(43)

Safe body current 

Safe body current 

From Biological research, human

From Biological research, human

body can

body can

toler

toler

ate

ate

-10 milliamps of sustained body current -10 milliamps of sustained body current

-100 milliamps of short-time body current for less than one -100 milliamps of short-time body current for less than one

second. second.

43

(44)

Accident Prevention

Accident Prevention

1.

1. EverEvery acciy accident cdent can be avoan be avoided iided if earthf earthing is peing is perfectrfect, safe, safetyty

devices used and maintained as per Indian standard and I.E.

devices used and maintained as per Indian standard and I.E.

rules and safety instruction followed given I.E. rules and

rules and safety instruction followed given I.E. rules and

various Indian Standard during

various Indian Standard during working.working.

2.

2. consconstructtruction ion mainmaintenatenance nce and and operaoperation tion carricarried ed out out as as per per 

I.E. rules, methods of

I.E. rules, methods of construction and concerned Indianconstruction and concerned Indian

standards and all safety slogans followed and workers and

standards and all safety slogans followed and workers and

supervisor understand there responsibility and public follow

supervisor understand there responsibility and public follow

directives as per Indian electricity rules 1956 rule 82

(45)

Reporting & Investigation of Electrical

Reporting & Investigation of Electrical

 A

 A

c

c

c

c

i

i

d

d

e

e

n

n

ts

ts

All out efforts are usually made

All out efforts are usually made

to ensure that no

to ensure that no

electrical accidents happened, inspite of best

electrical accidents happened, inspite of best

efforts.

efforts.

It is

It is

seen

seen

that

that

a f

a f

ew accident

ew accident

s do happen

s do happen

here &

here &

there including in the consumers’ premises.

there including in the consumers’ premises.

In such

In such

situations, a definite procedure for

situations, a definite procedure for

reporting such accidents has been laid down in

reporting such accidents has been laid down in

the electricity act 2003 & IE Rules 1956.

the electricity act 2003 & IE Rules 1956.

45

(46)

Section 161( Notice of accidents & Section 161( Notice of accidents & enquires) of electricity act 2003.enquires) of electricity act 2003.

• This clause provide for giving notice/intimation of accidents occThis clause provide for giving notice/intimation of accidents occurring inurring in

connection with Generation, Tr

connection with Generation, Transmission, Distribution or use ansmission, Distribution or use of of 

electricity on lines & electrical plant, to the electrical inspector

electricity on lines & electrical plant, to the electrical inspector

• The electrical inspector or any other officer appointed in this behalf hasThe electrical inspector or any other officer appointed in this behalf has

the powers to enquire & report as to the

the powers to enquire & report as to the cause& the manner & extent tocause& the manner & extent to

which safety povisions have been complied with.

which safety povisions have been complied with.

• Under this clause, the electrical inspector has pUnder this clause, the electrical inspector has powerowers of civil court unders of civil court under

the code of civil

the code of civil procedure, 1908 fprocedure, 1908 for the purpose of or the purpose of enforcing theenforcing the

attendance of withness & compelling the production of

attendance of withness & compelling the production of documents &documents &

material objects.

material objects.

46

(47)

IE Rule 44 A

IE Rule 44 A

• If any accidents occurs in connection with If any accidents occurs in connection with thethe

generation, tr

generation, transmission, supply or use of ansmission, supply or use of energy in or inenergy in or in

connection with, any part of the

connection with, any part of the electric supply lines orelectric supply lines or

other works of any person & the accidents results in or

other works of any person & the accidents results in or isis

likely to hav

likely to have resulted in the e resulted in the loss of human loss of human or animal lifeor animal life

or any injury to a human being or an animal.

or any injury to a human being or an animal. •

• such person or any authorized person of the Statesuch person or any authorized person of the State

Electric Board/ supplier

Electric Board/ supplier, not below , not below the rank of the rank of the Juniorthe Junior

Engineer or equivalent shall sent to the inspector a

Engineer or equivalent shall sent to the inspector a

telegraphic r

telegraphic report within 24 hours of eport within 24 hours of the knowledge of the knowledge of 

the occurrence of

the occurrence of the fatal accident.the fatal accident. •

• And a written report in the form set oAnd a written report in the form set out in annexure XIIIut in annexure XIII

within 48 hrs. of the k

within 48 hrs. of the knowledge of occurrence of fatal &nowledge of occurrence of fatal &

all other accidents.

(48)

• Where practicable a telephonic message should also Where practicable a telephonic message should also bebe

given to the inspector immediately after the accidents

given to the inspector immediately after the accidents

come to the knowledge of the author

come to the knowledge of the authorized officer of theized officer of the

State Electric Board/ Supplier or other person concerned.

State Electric Board/ Supplier or other person concerned. •

• After reporting to After reporting to the electrical inspectorthe electrical inspector, such accidents, such accidents

are investigated by the executive engineer/

are investigated by the executive engineer/

superintending engineer in detail to

superintending engineer in detail to decide the exactdecide the exact

cause

cause of of the acthe accident, cident, to to pay pay compensation compensation to to thethe

victims as per the

victims as per the law & tlaw & to fix up ro fix up responsibility esponsibility for thefor the

accident & undertake remedial measures to

accident & undertake remedial measures to avoideavoide

recurrence.

recurrence.

48

(49)

Annexure XIII

Annexure XIII

• This is a This is a prescribed form for reporting electrical accidentsprescribed form for reporting electrical accidents

to the electrical inspector.

to the electrical inspector. •

• A copy of this form should also A copy of this form should also be sent to the concernedbe sent to the concerned

police station & district magistrat

police station & district magistrate of the e of the area.area.

49

(50)

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