Trane Technologies CenTraVac CVHE, Installation, Operation And Maintenance Manual

Page: 60 / 108

60 CVHE-SVX005B-EN
Table 17. 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 . Wire length is for copper conductors only.
2 . 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 18. 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 . Wire length is for copper conductors only.
2 . 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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