Recommended Wire Lengths For Pts - Trane CVHE Troubleshooting Manual

The maximum recommended wire length for PT leads in a dual PT system are:
Wire Max Wire Length
Gauge Primary (ft)
8 3061
9 2428
10 1924
11 1526
12 1211
13 960
14 761
15 603
16 478
17 379
18 301
19 238
20 189
21 150
22 119
Note: These wire lengths are for copper conductors only
Note: The above lengths are maximum round trip wire lengths. The maximum distance
the PT can be located is 1/2 of the listed value.
CVHE-SB-32A
Max Wire Length
Primary (m)
933
740
586
465
369
292
232
184
145
115
91
72
57
45
36
Max Wire Length
Secondary (ft)
711
564
447
355
281
223
177
140
111
88
70
55
44
34
27
Max Wire Length
Secondary (m)
217
172
136
108
85
68
53
42
33
26
21
16
13
10
8
106