Clearance Requirements for Unit Mount PowerPact B Circuit Breakers
When installing unit mount PowerPact B-frame circuit breakers and automatic switches in equipment, minimum distances (safety clearance) must be maintained between the device and panels, bars, or any metal installed nearby.
Minimum distances depend on the ultimate breaking capacity, and are defined by tests carried out in accordance with the IEC/EN60947-2 standard.
If IEC installation conformity is not checked by type tests, you must also:
Use insulated bars for circuit breaker connections.
Block off the busbars by using rear insulation screens.