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Cranes and hoists are essential to modern industrial facilities and construction operations. Because they present their own set of potential hazards, the NEC devotes Article 610 to the requirements for installing the electrical equipment associated with them.
The first thing to note is there are special requirements for hazardous locations [610.3(A)]. Refer to Article 501, 502, or 503 as appropriate, plus Article 500.
So what if you’re not installing a crane or hoist in a Hazardous Location but it’s going to operate over combustible materials? In that case, you need to ensure the resistors are in a cabinet, cage, or cab composed of noncombustible material [610.3(B)]. If it’s an electrolytic line, you need to refer to 668.32.
Part II of Article 610 is pretty much the “meat” of the Article. It’s all about the wiring. Some things to note about conductors for cranes and hoists are that they have their own: