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What is the maximum short time setting which can be used for reducing the Arc Flash Energy?
The maximum breaker setting of the short time pickup of the upstream device associated with a particular AFE location needs to be below the arc flash...
Why cannot NEC 240.67 be found in NEC 2014 Edition?
NEC 240.67 is proposed for entry into NEC 2017 Edition and is presently in the "Draft/Out for Comments" phase as of May, 2016. NEC 240.67 is expected...
What are the differences between ZSI and bus differential protection?
ZSI protects busses between the associated breakers with ZSI feature. Differential protection protects the associated breakers and the busses and...
Do fusible distribution systems above 1200 amps need to comply with NEC 240.87?
No, NEC 240.87 is in reference to circuit breaker applications only. There are some expected changes in the future to NEC 240.67 that impose similar...
Is high-resistance grounding an approved equivalent means of reducing arc-flash per NEC 240.87?
No, high-resistance grounding may reduce the risk, but it does not reduce the hazard and per NEC 240.87 the approved equivalent means must reduce...
What is an advantage with zone-selective interlocking in complying with NEC 240.87?
Zone-selective interlocking preserves coordination between main, tie and feeder circuit breakers. It also allows for fast tripping within the protective...
If I use a circuit breaker with a 1200 amp frame with a 400 amp trip sensor, will I need to comply with NEC 240.87?
The NEC 240.87 requirements apply to breakers where the “trip setting” can be 1200A or more.  The maximum trip setting of SqD breakers is based on...
Video: What is the Proficient program offered by Schneider Electric?
Issue: Customer requesting information on the Proficient Program Product Line: Partner products Environment: Customer relations Resolution:  The Proficient...
What is the magnetic trip setting of a MAL36400 circuit breaker?
Product Line: Legacy Circuit Breakers Environment: Electrical Distribution Equipment Resolution: The magnetic trip setting is 2000 -4000 Amp CTA-ID...
Can the lugs on a QB type breaker be removed or replaced?
Product Line: Circuit Breakers PowerPact Q Environment: Electrical Distribution Equipment Resolution: No, the lugs not removable or replaceable. CTA-ID...
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