Section 4—Installation
Power-Style™ QED-2 Switchboards
33
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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)
1
AND
•
Cables meet the
Yes
OR
•
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.
1
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