DC Connections¶
Warning
SHOCK HAZARD. The DC input and output connections may still be live despite AC power being off or disconnected. Always measure both the DC input terminal and DC output terminal with respect to ground to ensure zero voltage before making any connections.
The BDx Module DC input and DC output consist of independent heavy-duty copper bus bars with a 3/8” threaded insert. Magna-Power recommends DC power cables be crimped to ring terminals and securely fastened to bus bars using the included 3/8” bolts, washers, and lock washers. The recommended torque for the DC connection is 240 in-lbf (27.1 N-m).
Select a wire size sufficient to handle the maximum output current of the unit, no matter what the intended load current or current limit setting. Connections can be made on top and bottom of the bus bars. Beyond two wire connections, a mating bus bar will need to be added to provide additional mounting holes.
The recommended wire size for different current levels are shown in the table below.
Wire Size (USA) |
Equivalent Wire Size
(International)
|
Wires Per Output Terminal |
Maximum Current |
|---|---|---|---|
6 AWG |
10 mm2 |
1 |
85 Adc |
4 AWG |
25 mm2 |
1 |
110 Adc |
3 AWG |
25 mm2 |
1 |
130 Adc |
2 AWG |
35 mm2 |
1 |
150 Adc |
1 AWG |
50 mm2 |
1 |
170 Adc |
1/0 AWG |
50 mm2 |
1 |
200 Adc |
2/0 AWG |
70 mm2 |
1 |
235 Adc |
3/0 AWG |
95 mm2 |
1 |
275 Adc |
4/0 AWG |
120 mm2 |
1 |
315 Adc |
1/0 AWG |
50 mm2 |
2 |
400 Adc |
2/0 AWG |
70 mm2 |
2 |
470 Adc |
3/0 AWG |
95 mm2 |
2 |
550 Adc |
4/0 AWG |
120 mm2 |
2 |
630 Adc |
1/0 AWG |
50 mm2 |
4 |
800 Adc |
2/0 AWG |
70 mm2 |
4 |
940 Adc |
3/0 AWG |
95 mm2 |
4 |
1100 Adc |
4/0 AWG |
120 mm2 |
4 |
1260 Adc |
Notes:
Capacity for AWG wires derived from the National Electric Code. Maximum ambient temperature: 40°C. Maximum wire temperature: 90°C. Continuous duty with wires in free air, not bundled or in conduit.
Capacity of aluminum wire is approximately 84% of the capacity listed for copper wire.
For higher current levels, it’s recommended to use bus bars with holes for additional cable feeds or direct bus bar connection to the load.
Warning
FIRE HAZARD. Select a wire size large enough to carry the maximum planned operating current to prevent overheating of the wires. Make sure power cable connections are secured tightly in accordance with the torque recommendation to prevent overheating of the bus bars.