0611CT1603

B-Frame Safety Clearance, 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

Operating voltage V < 690 Vac

For devices equipped with:

Clearance

Between devices

Between device and sheet metal

Painted sheet metal

Bare sheet metal

A1

A2

B

A1

A2

B

No terminal accessories

0

30 mm
(1.18 in.)

5 mm
(0.19 in.)

0

40 mm
(1.57 in.)

5 mm
(0.19 in.)

5 mm
(0.19 in.)

Interphase barriers

0

0

0

0

0

0

5 mm
(0.19 in.)

Long terminal shields

0

0

0

0

0

0

5 mm
(0.19 in.)

Minimum Safety 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
(7.87 in.)

100 mm
(3.94 in.)

120 mm
(4.72 in.)

60 mm
(2.36 in.)

Exposed Conductor Safety Clearance

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.).

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