58 Planning the electrical installation
Sizes of grounding conductor terminals are listed below.
Conduit
Bridge the joints of the conduits with a ground conductor bonded to the conduit on each
side of the joint. Bond the conduits also to the converter enclosure and generator frame.
Use separate conduits for input power, generator, DC resistors, and control wiring. When
conduit is employed, type MC continuous corrugated aluminum armor cable or shielded
cable is not required. A dedicated ground cable is always required.
Note: Do not run generator wiring from more than one converter in the same conduit.
Armored cable / shielded power cable
Six conductor (3 phases and 3 ground) type MC continuous corrugated aluminum armor
cable with symmetrical grounds is available from the following suppliers (trade names in
parentheses):
• Anixter Wire & Cable (Philsheath)
• BICC General Corp (Philsheath)
• Rockbestos Co. (Gardex)
• Oaknite (CLX).
Shielded power cables are available from Belden, Lapp Kabel (ÖLFLEX) and Pirelli,
among others.
Maximum ampere rating of
overcurrent protection for
field wiring conductors
supplying panel
Size of equipment grounding or bonding conductor, minimum
Copper Aluminum
AWG or kcmil
mm
2
AWG or kcmil
mm
2
15 14 2.1 12 3.3
20 12 3.3 10 5.3
30 10 5.3 8 8.4
40 10 5.3 8 8.4
60 10 5.3 8 8.4
100 8 8.4 6 13.3
200 6 13.3 4 21.2
300 4 21.2 2 33.6
400 3 26.7 1 42.4
500 2 33.6 1/0 53.5
600 1 42.4 2/0 67.4
800 1/0 53.5 3/0 85.0
1000 2/0 67.4 4/0 107.2
1200 3/0 85.0 250 kcmil 127
1600 4/0 107.2 350 177
2000 250 kcmil 127 400 203
2500 350 177 600 304
3000 400 203 600 304
4000 500 253 800 405
5000 700 355 1200 608
6000 800 506 1200 608
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