PowerPact B-Frame Clearances, IEC Standard
For all types of PowerPact B-frame circuit breakers that use uninsulated power connections (for example, busbars, spreaders, or uninsulated compression lugs), the minimum clearance distance between the enclosure backplate and uninsulated power connections is shown below.
When using uninsulated connectors be sure to maintain the proper clearance between live parts and the grounded metallic back pan or use the insulation screen.
Minimum Enclosure Dimensions
Minimum Clearances to Bare Busbars
Operating voltage V ≤ 690 Vac |
|||
---|---|---|---|
Clearances to live bare busbars * |
|||
Spacing E ≤ 60 mm (2.36 in.) |
Spacing E > 60 mm (2.36 in.) |
||
D1 |
D2 |
D1 |
D2 |
200 mm |
100 mm |
120 mm |
60 mm |
Exposed Conductor Clearances
An insulating screen or long terminal shield is required if:
-
2, 3, or 4 poles
-
C < 9.5 mm (< 0.37 in.),
Customer-provided insulation material required if:
-
1 pole
-
C < 12.7 mm (< 0.5 in.).