The standard reference documents for electrical installations in North America are the National Electric Code (NEC) for the USA and the Canadian Electrical Code (CEC) for Canada.
It is important to understand that electrical equipment used in ordinary, wet and hazardous (or classified) locations must be ‘listed’ by an accredited approval agency for use in the intended location. The hazardous locations include areas in which flammable, combustible or ignitable substances may occur in hazardous amounts.
Under NEC and CEC technical standards, cable glands must be tested using samples of the proposed cable type(s) before they can be approved for use in the intended hazardous location.
Group I
NEC/CEC
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