Trane CenTraVac CDHF Series Installation, Operation And Maintenance Manual page 55

Table 17. Maximum recommended wire length for
secondary current transformer (CT) leads in dual CT
system (continued)
(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
for potential transformers (PTs) in a single
PT system
Wire AWG (a)
8
10
12
14
16
17
18
20
21
22
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.
Wires, lugs, and fuses/breakers are sized based on National Electric
(a)
Code (NEC) [NFPA 70] and UL 1995.
CDHF-SVX01N-EN
Maximum Lead Length
Feet Meters
5339 1627
3357 1023
2112 643
1328 404
835 254
662 201
525 160
330 100
262 79
207 63
C C u u s s t t o o m m e e r r - - s s u u p p p p l l i i e e d d R R e e m m o o t t e e S S t t a a r r t t e e r r W W i i r r i i n n g g
Table 19. Maximum recommended total wire length
(to and from) for PT leads in a dual PT
system
Max Wire Length
Wire AWG
Primary
(a)
Feet Meters
8 3061
10 1924
12 1211
14 761
16 478
17 379
18 301
20 189
21 150
22 119
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.
Max Wire Length
Secondary
Feet Meters
933 711 217
586 447 136
369 281 85
232 177 53
145 111 33
115 88 26
91 70 21
57 44 13
45 34 10
36 27 8
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