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A coal safety certificate is unnecessary unless the equipment and materials are intended for underground applications. For surface use, such certification is not required.

The term 'intrinsically safe' denotes the inherent safety of a device, signifying that safety is a built-in feature. Conversely, 'non-intrinsically safe'...

The intrinsically safe type, also referred to as the intrinsically safe category, is considered the safest among the various explosion-proof classifications.