Trane Technologies CVHF - Current Transformer and Potential Transformer Wire Sizing

Current Transformer and Poten-
tial Transformer Wire Sizing
For customer-supplied starter to chiller unit control panel
starter module 1A23 these wires must be separated from
120 Vac or higher wiring.
Table 12. Maximum recommended wire length for sec-
ondary CT leads in dual CT system
Wire AWG (mm
2
) Maximum Wire Length Secondary
CT Leads
Feet Meters
8 (10) 1362.8 415.5
10 (6) 856.9 261.2
12 (4) 538.9 164.3
14 (2.5) 338.9 103.3
16 (1.5) 213.1 65.0
17 (1) 169.1 51.5
18 (0.75) 134.1 40.9
20 (0.5) 84.3 25.7
Note:
1. Wire length is for copper conductors only.
2. Wire length is total one-way distance that the CT can be
from the starter module.
Table 13. Maximum recommended total wire length for
PTs in a single PT system
Wire Gauge 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
Note:
1. Wire length is for copper conductors only.
2. The above 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.
Table 14. Max recommended total wire length (to and
from) for PT leads in a dual PT system
Wire
Gauge
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. The above length is maximum round trip wire length. The maxi-
mum distance the PT can be located from the starter module is half of
the listed value.
42 TCVHE-SVX04D-EN
Customer-Supplied Remote Starter Wiring
RELEASED 10/Mar/2020 06:59:20 GMT