CVHH-SVX001G-EN
57
Current Transformer and
Potential Transformer Wire
Sizing
For customer-supplied starter-to-chiller unit control
panel starter module 1K23; these wires must be
separated from 120 Vac or higher wiring.
Table 20.
Maximum recommended wire length for
secondary current transformer (CT) leads in
dual CT system
Wire AWG
(a)
Maximum Wire Length
Secondary CT Leads
Feet
Meters
8
1362.8
415.5
10
856.9
261.2
12
538.9
164.3
14
338.9
103.3
16
213.1
65.0
17
169.1
51.5
18
134.1
40.9
20
84.3
25.7
Notes:
1
.
For AWG/MCM equivalents in mm
2
, refer to the table in
“Electrical Requirements,” p. 53
.
2
.
Wire length is for copper conductors only.
3
.
Wire length is total one-way distance that the CT can be from
the starter module.
(a)
Wires, lugs, and fuses/breakers are sized based on National Electric
Code (NEC) [NFPA 70] and UL 1995.
Table 21. Maximum recommended total wire length
for potential transformers (PTs) in a single
PT system
Wire AWG
(a)
Maximum Lead Length
Feet
Meters
8
5339
1627
10
3357
1023
12
2112
643
14
1328
404
16
835
254
17
662
201
18
525
160
20
330
100
21
262
79
22
207
63
Notes:
1
.
For AWG/MCM equivalents in mm
2
, refer to the table in
“Electrical Requirements,” p. 53
.
2
.
Wire length is for copper conductors only.
3
.
Wire length is maximum round trip wire length. The maximum
distance the PT can be located from the starter module is half of the
listed value.
(a)
Wires, lugs, and fuses/breakers are sized based on National Electric
Code (NEC) [NFPA 70] and UL 1995.
Table 22.
Maximum recommended total wire length
(to and from) for PT leads in a dual PT
system
Wire AWG
(a)
Max Wire Length
Primary
Max Wire Length
Secondary
Feet
Meters
Feet
Meters
8
3061
933
711
217
10
1924
586
447
136
12
1211
369
281
85
14
761
232
177
53
16
478
145
111
33
17
379
115
88
26
18
301
91
70
21
20
189
57
44
13
21
150
45
34
10
22
119
36
27
8
Notes:
1
.
For AWG/MCM equivalents in mm
2
, refer to the table in
“Electrical Requirements,” p. 53
.
2
.
Wire length is for copper conductors only.
3
.
Wire length is maximum round trip wire length. The maximum
distance the PT can be located from the starter module is half of the
listed value.
(a)
Wires, lugs, and fuses/breakers are sized based on National Electric
Code (NEC) [NFPA 70] and UL 1995.
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