Square QED-2 - Cable Restraint for Short-Circuit Current Rating (SCCR); Figure 25 - Cable Restraint Example; Table 2

To Next Page

To Previous Page

Section 4—Installation Power-Style™ QED-2 Switchboards

ENGLISH

Cable Restraint for Short-Circuit Current Rating (SCCR)

Cable restraint is recommended for lugs mounted on bus when the following

conditions are met:

• Unsupported cable lengths are greater than 3.5 ft. (1 m)

AND

• Cables meet the Yes criteria shown in Table 2.

• When otherwise specified.

NOTE: For I-Line™ circuit breakers, or if the lugs are in the circuit breaker,

refer to the instruction bulletin for the specific circuit breaker.

Cable length is measured from the end of the lug to the conduit fitting through which the cable exits.

Table 2 – Cable Restraint Criteria

Cable Ampacity

Available Short Circuit Fault Current (RMS)

< 65 kA 65 to < 85 kA 85 to < 150 kA 150 to 200 kA

 800 A No Yes Yes Yes

1200 A No No

Yes Yes

1600 A No No

Yes Yes

2000 A No No Yes Yes

2500 A No No No

Yes

3000 A No No No

Yes

 4000 A No No No No

Figure 25 – Cable Restraint Example

Square QED-2 - Cable Restraint for Short-Circuit Current Rating (SCCR); Figure 25 - Cable Restraint Example; Table 2 - Cable Restraint Criteria