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.

What is arc resistant switchgear?

For complete protection for surrounding operators and personnel RIC Power Corp offers Arc Resistant Switchgear. Combining high strength steel, a compartmentalized and reinforced structure, and plenum and exhaust chute, Arc Resistant Switchgear contains and protects from potentially hazardous arcing events.

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 does a switchgear arc quenching device work?

When chosen to activate an arc quenching device (e.g. an ES) the reduction in the incident energy can be more significant if the device acts much faster than the circuit breaker can extinguish the current. Switchgear standard current sensors provide actual current information.

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.