System
e) Lateral Mains e) Lateral Mains -- 11
Adequate space for lateral mains and meter board Adequate space for lateral mains and meter board
Adequate space for lateral mains and meter board Adequate space for lateral mains and meter board
wiring shall be provided in meter room. wiring shall be provided in meter room.
Th l di 3 h l t l i h ld b
Th l di 3 h l t l i h ld b
The loading on 3 phase lateral mains should be The loading on 3 phase lateral mains should be
balanced as far as practicable. balanced as far as practicable.
An installation requiring more than 60A is required to An installation requiring more than 60A is required to
be arranged to service a 3
be arranged to service a 3--phase supply.phase supply.
Appropriate correction factors shall be applied for Appropriate correction factors shall be applied for
determining the current carrying capacity of cables. determining the current carrying capacity of cables.
3.2 Internal Power Distribution
3.2 Internal Power Distribution
System
System
e) Lateral Mains e) Lateral Mains -- 22
Distribution board switchgear and
Distribution board switchgear and busbarbusbar chamberchamber
Distribution board, switchgear and Distribution board, switchgear and busbarbusbar chamber chamber
should have phase identification. should have phase identification.
Wh bl d t d t th h
Wh bl d t d t th h
Where cables, conducts, ducts pass through Where cables, conducts, ducts pass through
structural element such as floors and walls, the structural element such as floors and walls, the
i h ll b l d b i t fi i t t
i h ll b l d b i t fi i t t
openings shall be sealed by appropriate fire resistant openings shall be sealed by appropriate fire resistant materials. In addition, internal fire
materials. In addition, internal fire--resistant barriers resistant barriers shall be provided to prevent the spread of fire
shall be provided to prevent the spread of fire shall be provided to prevent the spread of fire. shall be provided to prevent the spread of fire.
Segregation of lowSegregation of low--voltage circuits, fire alarm circuits voltage circuits, fire alarm circuits
d t l h / t l i ti i it h ll b
d t l h / t l i ti i it h ll b
and telephone/ telecommunication circuits shall be and telephone/ telecommunication circuits shall be made when they run together.
3.2 Internal Power Distribution
3.2 Internal Power Distribution
System
System
e) Lateral Mains e) Lateral Mains -- 33
Connection between the electricity supplier
Connection between the electricity supplier’’s meters meter
Connection between the electricity supplierConnection between the electricity supplier’’s meter s meter
and the consumer
and the consumer’’s main switch should be not less s main switch should be not less
than 4mm
than 4mm22 stranded copper conductorstranded copper conductor
than 4mm
than 4mm2 2 stranded copper conductor.stranded copper conductor.
The insulation and/ or sheath of the cables shall be The insulation and/ or sheath of the cables shall be
d f di t f 150 f th
d f di t f 150 f th
removed for a distance of 150mm from the removed for a distance of 150mm from the
connection, and replaced if necessary by suitable connection, and replaced if necessary by suitable heat
heat resisting insulation when connecting the cable toresisting insulation when connecting the cable to heat
heat--resisting insulation when connecting the cable to resisting insulation when connecting the cable to bare conductors/
3.2 Internal Power Distribution
3.2 Internal Power Distribution
System
System
e) Lateral Mains e) Lateral Mains -- 44
Warning notice
Warning notice ““DANGERDANGER”” in red legible letter within red legible letter with
Warning notice Warning notice –– ““DANGERDANGER”” in red legible letter with in red legible letter with
Chinese translation shall be displayed near each Chinese translation shall be displayed near each
distribution board Each character shall not less than distribution board Each character shall not less than distribution board, Each character shall not less than distribution board, Each character shall not less than 10mm high.
10mm high.
Wh i t ll ti i t d t i i i
Wh i t ll ti i t d t i i i
Where an installation is connected to rising mains, Where an installation is connected to rising mains,
agreement should be obtained from the owner of agreement should be obtained from the owner of rising mains if new current demand exceed that rising mains if new current demand exceed that rising mains if new current demand exceed that rising mains if new current demand exceed that before. Moreover, prior approval from the power before. Moreover, prior approval from the power company should be obtained before any alteration company should be obtained before any alteration company should be obtained before any alteration company should be obtained before any alteration work is carried out.