Are arc flash and arc-flash studies a safety concern?
Arc-flash and arc-flash studies are also clarified. This White Paper also highlights a safety concern when HV/MV switchgear fails catastrophically, particularly oil-filled switchgear assembly. Within IEC Standards, HV switchgear are used on systems above 1 kV up to 52 kV. In North America MV is any voltage between 600 V and 69 kV.
How to evaluate arc rated switchgear in Canada?
Canada use CSA C22.2 No. 0.22-11 “Evaluation methods for arc resistance rating of enclosed electrical equipment” to evaluate internal arc rated switchgear. Internal arc type testing is very important to reduce the risk of exploding switchgear.
Does switchgear pass an arc type test?
Some switchgear is type tested during its design stage to pass an internal arc type test. Switchgear that has been designed to contain the arc should fail safely, thus avoiding risk to operators and preventing lengthy rebuilding time following catastrophic failure, should they occur.
Can LV switchgear be internal arc rated?
It is important for the Duty Holder to request internal arc rated switchgear at MV and LV. LV switchgear can be internal arc tested in accordance with IEC/TR 61641 “Enclosed low-voltage switchgear and controlgear assemblies – Guide for testing under conditions of arcing due to internal fault”.
Are arc-flash sensors safe?
Sensors available in the market today detect light from an arc-flash inside switchgear very quickly, typically less < 100 ms, and trip the incoming supplies to the switchgear. Some concern has been expressed whether the sensors fail safe. North American Arc resistant testing standards are defined by ANSI/IEEE C37.20.7.
Is arc rated switchgear IEC rated?
Within IEC Standards, internal arc rated switchgear manufactured prior to may only have been tested for internal arc in the main MV switching compartment, which was the optional requirements within IEC 60298 (the standard that was superseded by IEC 62271-200).
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