General Method for Cable Sizing
Full text
(2)
(3)
(4) c .
(5)
(6)
(7)
(8) c
(9)
(10)
(11) .
(12)
(13)
(14) !
(15) ! . . " # . $
(16) . . !. . . . !. . "
(17)
(18) # $ % !%
(19) u Selection of wiring systems (table 52-1 of IEC 60364-5-52) .
(20) % .
(21) ! '!'()* ! )* )( )(')'+ *( *( *'** !. & "
(22) -+-, .
(23) *-*/ . 1& . !. -!-). . ,. )+*0 *!*)*+*, (! +!+) '* (-/0)+),)'++ +, ! )!)). . " # .
(24)
(25)
(26)
(27) ', '''* '''*. ,!,),+,, ,' ,!,),+,, ,' -!-). . . . . !. . !. . . (-/0 ,!,),+,, ,( ,' ,!,),+,, ,( ,' . /! /! ! ! !
(28)
(29)
(30) c&
(31) &
(32) 'c(). ,* . . #
(33) ! '!'()* ! )* & )( )(')'+ "
(34) *( *( *'** ! -+-, ! -!-) .
(35) *-*/ , )+*0 *!*)*+*,. . " # .
(36)
(37)
(38)
(39) ', '''* '''*. ,!,),+,, ,' ,!,),+,, ,' -!-). . . . . !. . !. . .
(40) . 1& . . . !. (-/0)+),)'++ +, )!)). . . /!. /!. !. . . (! +!+) '*. (-/0 ,!,),+,, ,' ,!,),+,, ,' ! !. ,(. . ,(. ,*. . .
(41) * ' . +
(42) . ,
(43)
(44)
(45)
(46)
(47)
(48) 2) . ). . +.
(49) 2+ . '.
(50) ) !, 3 . *. . +!.
(51) +. !,3
(52) 43 " !,3
(53) . . ,!. 1 . ". 1 . .5. . 6. . ,). . ,( . -!.
(54)
(55) . -).
(56)
(57) .
(58) % !%
(59) u Erection of wiring systems (table 52-2 of IEC 60364-5-52) . $
(60) 2 &56)! & 26 & & u Examples of methods of installation (part of table 52-3 of IEC 60364-5-52) . % &
(61) 7
(62) &
(63) . 3 3 5 3
(64) & c(( . $ & $8" " # 9:$.
(65)
(66) .$; $8"&
(67) 3
(68) 3
(69)
(70) . $ & $8" " # 9:$.
(71)
(72) .$; $8"&
(73) 3 . . 0 -! 0! -! )!* . -! 0! -! . .
(74)
(75) 3
(76)
(77) . )!* . u Maximum operating temperatures for types of insulation (table 52-4 of IEC 60364-552) .
(78)
(79) #& &
(80)
(81) &
(82) #)#+4. . <
(83)
(84) áY. 2
(85) .
(86)
(87) & 7 ,!="5 & c(1$8".$; 9:$. #) 2 0 )! )* +! +* ,* '! '* *! ** (!. 3 )++ ))- ))+ )!( !0' !/- !-0 !-) !() !*!. 45 , ))* ))+ )!/ )!' !0( !0) !/- !/+ !-( !-).
(88) (* -! -* /!. . !(* !*/ !*! !'). u Correction factors for ambient air temperatures other than 30 °C to be applied to the current-carrying capacities for cables in the air (from table A.52-14 of IEC 60364-5-52)
(89)
(90) & 7 +!="5 & c(6 $8".$; 9:$. c 0 )! )* +* ,! ,* '! '* *! ** (! (* -! -* /!. 3 ))! )!* !0* !/0 !/' !-- !-) !(, !** !'* . 45 , )!- )!' !0( !0, !/0 !/* !/! !-( !-) !(* !(! !*, !'( !,/. #+ u Correction factors for ambient ground temperatures other than 20 °C to be applied to the current-carrying capacities for cables in ducts in the ground (from table A.52-15 of IEC 60364-5-52) .
(91) áY. &.
(92)
(93) &7 +*> ?@5 & & c(7 #, &> ?@ " . ) ))/. )* )). + )!*. +* ). , !0(. u
(94) Correction factors for cables in buried ducts for soil thermal resistivities other than 2.5 K.m/W to be applied to the current-carrying capacities for reference method D (table A52.16 of IEC 60364-5-52) 3 3
(95) & & #, c(8 * 8 @ 8
(96) #. 6 )+) )), )!* )!! !/(. u Correction factor k3 depending on the nature of soil áY. 6
(97) . &
(98) 7
(99)
(100) 4
(101)
(102)
(103) A
(104)
(105)
(106) @
(107) .
(108) #'
(109) .3 & c(9 c( c(9& & #'
(110)
(111)
(112) 2
(113) *
(114)
(115) -
(116)
(117) ,
(118)
(119) ! ( 1 6 7 8 9 : & (1 (9 1) )!!!/!!-!!(*!(!!*-!*'!*+!*!!'* !') !,/ 25
(120) )!!!/*!-0!-*!-,!-+!-+!-)!-!% " .
(121) 3 !0*!/)!-+!(/!((!('!(,!(+!() )!!!//!/+!--!-*!-,!-,!-+!-+ . 5 B & )!!!/-!/+!/!!/!!-0!-0!-/!-/ u Reduction factors for groups of more than one circuit or of more than one multi-core cable (table A.52-17 of IEC 60364-5-52) c(:& & #'
(122)
(123)
(124) . . $ . ,) . * * - ;
(125)
(126) ) + , ) !0/ !0) !/- + !0( !/- !/)
(127) B , !0* !/* !-/.
(128) ) 8 . ,). !0(. !/(
(129) & . . +. !0*. !/'. ) +. )!! !0/. !0- !0,. !0( !/0. ,. !0-. !0!. !/(. ) +. )!! !0-. !0/ !0,. !0( !/0. ,. !0(. !0+. !/(. ) +. )!! )!!. !0) !0!. !/0 !/(. ) +. )!! !0-. )!! !0*. )!! !0,. ,. !0(. !0'. !0!. : . ,+ ,, ,'. . ,) $ .
(130) B . . 8 . ,) .
(131) . . : . ,+ ,,. . ,'. . u Reduction factors for groups of more than one circuit of single-core cables to be applied to reference rating for one circuit of single-core cables in free air - Method of installation F. (table A.52.21 of IEC 60364-5-52) c(& & #'
(132) . *
(133)
(134) + ,.
(135)
(136)
(137) ! *
(138)
(139) ! "
(140) !-* !/! !(* !-!. )'(18 !/* !-*. )'18 )'8 !0! !0! !/! !/*.
(141) ' * (. !(! !** !*!. !(! !** !**. !-! !(* !(!. !-* !-! !-!. !/! !/! !/!. . -
(142)
(143) . . # -
(144)
(145) u Reduction factors for more than one circuit, single-core or multi-core cables laid directly in the ground. Installation method D. (table 52-18 of IEC 60364-5-52) áY. m . '*
(146)
(147) , m&
(148) & ,
(149) #*
(150) .
(151) , , ,,C
(152) B
(153)
(154) # & #* , & c(& .
(155)
(156)
(157) <
(158)
(159) #
(160) #
(161)
(162)
(163) !)* )! )*,, !/( ,,'* !/( D'* )! u Correction factors for harmonic currents in four-core and five-core cables (table D.52.1 of IEC 60364-5-52) . 2
(164)
(165)
(166) -
(167)
(168)
(169) ." (!,('**+ 3 &
(170) &
(171)
(172) # .
(173) 2 3 c1)& $8" *
(174) -
(175)
(176)
(177) 1!. 2( 21 =(=1. +. . . . . . ) . +. ,. . '. *. (. -. .
(178) )* +* ' ( )! )( +* ,* *! -! 0* )+! )*! )/* +'! ,!! 2 +* ' ( )! )( +* ,* *! -! 0* )+! )*! )/* +'! ,!! . ),* )/ +' ,) '+ *( -, /0 )!/ ),( )(' )// +)( +'* +/( ,+/. ), )-* +, +0 ,0 *+ (/ /, 00 )+* )*! )-+ )0( ++, +() +0/. )** +) +/ ,( *! (/ /0 ))! ),' )-) +!- +,0 . )* +! +- ,' '( (+ /! 00 ))/ )'0 )-0 +!( . )-* +' ,+ ') *- -( 0( ))0 )'' )/' ++, +*0 +00 ,') '!, '('. )/ +' ,) ,0 *+ (- /( )!, )++ )*) )-0 +!, +,! +*/ +0- ,,(. )' )/* +' ,+ ', *- -! /' )!- )+0 )'0 )-! )0' ++- +(). ),* )-* +, ,) ') *, (* -/ 0/ ))/ ),* )** )-( +!- +,-. )(*)** ++ +) +/ +- ,0 ,( *, '/ -! (+ /( -- )!' 0+ ),, ))( )() ),0 )/( )(! . )/* +* ,+ '' *0 -, 0! ))! )'! )-! )0- ++- +*0 ,!* ,*). )/* +' ,! '! *+ (( /! 0' ))- ),/ )*- )-/ +!! +,! +(!. . u Current-carrying capacities in amperes for different methods of installation, PVC insulation, three loaded conductors, copper or aluminium, conductor temperature: 70 °C, ambient temperature: 30 °C in air, 20 °C in ground (table A.52.4 of IEC 60364-5-52). .
(179)
Related documents
Lead the class through the following examples taken from Section VI of
This matrix is mandatory in the identification of high level HSE Risks during risk screening (Major Hazard Analysis, Environmental Impact Assessment etc.).. This matrix provides
SafeNet authentication solutions ensure easy and secure strong authentication for employees, partners, and customers and cover the entire spectrum of security needs, from remote
In this paper, the project plan robustness is evaluated as the probability of completing the project in the planning duration, the Monte Carlo method is used to simulate the
Keywords : Enterprise systems, ERP systems, business benefits, IS effectiveness, perceived net benefit flow, operational benefits, managerial benefits, strategic ben- efits,
FS calls this if stream needs to be encrypted FSRTL encrypts the stream, FS stores on disk.
In this edition of Biblical Perspectives we want to clarify some of the misconceptions about dispensationalism and use the Whisenant book as a case in point to demonstrate that
Qaradawi is head of the European Council for Fatwa and Research (ECFR), the theological body of the European Muslim Brotherhood and is also the leader of the Union of Good, a global