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INDEX
1.
INTRODUCTION.................................................................................................3
2.
OBJECTIVE........................................................................................................3
3. CODES AND
STANDARDS...................................................................................3
4. ELECTRICAL SYSTEM
DETAILS...........................................................................3
5. CABLE
INSTALLATION........................................................................................4
6. SIZING
CALCULATIONS......................................................................................4
7. LV CABLE
SIZING...............................................................................................4
8. REFERENCE
DOCUMENTS.................................................................................9
9. TYICAL
CALCULATIONS..................................................................................1!
1!.
NOTES............................................................................................................12
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1. INTRODUCTION
2. OBJECTIVE
T"# O$%#&'()# *+ '"(, -*&/#0' (, '* -#+(0# '"# M(0(//
&$# ,((0 #(#/#0' +* LV AC
*# &*0'* &$#, 0- DC &$#,.
3. CODES AND STANDARDS
IEC I0'#0'(*0 E#&'* T#&"0(& C*//(,,(*0 S'0--,
BS B('(," S'0--,
IEC:6!287 C&'(*0 *+ ' '(0,
IEC:6!364:4:43 L* V*'# E#&'(& I0,''(*0,
IEC:6!364:5:52 S##&'(*0 0- E#&'(*0 *+ E#&'(&
E(/#0':;((0 SV '* 3!>V
IEC:6!228 C*0-&'*, *+ (0,'#- &$#,
IEC:6!364:5:54 E#&'(& (0,''(*0, *+ $(-(0,
BS:7671 R#(#/#0', +* E#&'(& (0,''(*0,
4. ELECTRICAL SYSTEM DETAILS
LV System 415?24! V
Fre!e"#y 5! @System Ne!tr$% E$rt&'"( $ts!))%y e"*
S*(-< E'"#-
Des'(" F$!%t %e+e% 5!A +* 1,#&
,. CABLE INSTALLATION
T"# /#'"*-, *+ &$# (0,''(*0 ," $# , # G#0# E#&'(&
S#&(+(&'(*0 E#&'(&
R#(#/#0', +* - E(/#0' L* V*'# *# C*0'* C$#,
S#&(+(&'(*0.
-. SIIN/ CALCULATIONS
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C$#, ," $# ,(#- (0 &&*-0 ('" '"# +**(0 &('#( 0- '"#
##)0' ,'0--, (,'#- (0
'"(, -*&/#0'.
C*0'(0*, ' &' K !.94
$R'(0 +&'* +* *(0 *+ &$#, 6 &$#, ('"
!.15/ ,&(0> K!.57
F L*- ' FLA I$ K L*- >; =1!!!3 S
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F* 3",# AC *-,
F L*- ' FLA I$ K L*- >; =1!!!S; =1!!!S
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0., V%t$(e Dr) C$%#!%$t'"
0.,.1 A%%$%e V%t$(e Dr)
V%t$(e *r) *!r'"( mtr st$rt'"( #"*'t'"s s&$%% e %'m'te* t
256.
V%t$(e *r) *!r'"( mtr ste$*y st$te #"*'t'"s s&$%% e %'m'te*
t ,6.
0.,.2 Ste$*y st$te +%t$(e *r)
7$8 Fr AC C'r#!'ts
T"# )*'# -* 0-# 0*/ &*0-('(*0, (, ()#0 ,
V- K I$ L& R& C*, & S(0 > 1!!
1!!! V0 0;"##
V- K #'# )*'# -* ' 0*/ &*0-('(*0, V
I$ K R'#- ' ' + *- ' 0*/ &*0-('(*0 A
L& K C$# #0'" /',
R& K R#,(,'0 *+ &$# &*0-&'* O"/?/
& K R#&'0 *+ &$# &*0-&'* O"/?/
> K C*#++(&(#0' -#'#/(0#- $< '"# (0- *+ ,
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0 K 0* *+ 0,
0.,.3 V%t$(e Dr) !"*er mtr st$rt'"( #"*'t'"s
T"# )*'# -* +* '"##:",# /*'*, 0-# ,''(0 &*0-('(*0 (, )#(+(#-
('" '"# +*/H
V-,' K I$,' L& R& C*, ,' & S(0 ,' > 1!!
1!!! V0 0
;"##
V-,' K #'# )*'# -* ' /*'* ,''(0 '(/# V
I$,' K M*'* ' ' ,''(0 '(/# A
L& K C$# #0'" /',
R K R#,(,'0 *+ &$# &*0-&'* O"/?/& K R#&'0 *+
&$# &*0-&'* O"/?/
> K C*#++(&(#0' -#'#/(0#- $< '"# (0- *+ ,
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F L*- ' FLA I$ K L*- >; =1!!!3 S' = >,= >-=
>K!.54
T"# ' &
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R#,(,'0 K 9.45 *"/?>/
R#&'0 K !.!97 *"/?>/
L#0'" L K 15 /',
V- K 3 I$= R&C*, &S(0 L& 1!! 1!!! V0 0
V- K 3 !.515 = 9.45 !.76 !.!97 !.65 15 1!! 415 1 1!!!
V- K !.!23
V%t$(e Dr) !"*er mtr st$rt'"( #"*'t'"s
V- ,' K 3= I,'= R& C*,,' &S(0,' = L&= 1!! 1!!! V0
0
V- ,' K 3= 3.6 = 9.45=!.1!8 !.!97 =!.99 = 15 = 1!! 415 1!!!
1
V- ,' K !.!25
V*'# +* /*'* 0-# ,'#-
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15. NOTES
1. A/$(#0' '#/#'# (, &*0,(-##- , # '"# D*& 0*H
E0)(*0/#0' D#,(0 D'.
2. M=(// &*0-&'* *#'(0 '#/#'# *+ 9!C (, &*0,(-##- ,
# IEC6!364:5:52T$#.52.4 "(&" ()#, '"# /=(// *#'(0 '#/#'#, +* ';
'(0, &*0,(-##- ,('$< ('" #+##0 '* C"#/(& I0%#&'(*0
C**,(*0
I0"($('* / -' ,"##'.4. *# +&'* #++(&(#0&< 0- *-
*'* ' ,''(0 ' +* M*'*, # &*0,(-##-
,('$
