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Cranes and Hoists, Part 2

Cranes and Hoists, Part 2Contact conductor requirements for cranes and hoists are in Part III of Article 610; it consists of 8 Sections (A) through (H), plus Section 610.22. This last Section provides the requirements for collectors.

Let’s look at the collectors, first. They must be designed to minimize sparking between collectors and contact conductors. If these will operate in rooms used for storing easily ignitible fibers and materials, they must comply with 503.155 (a set of Class III provisions specifically for cranes and hoists).

The first requirement for the contact conductors is that they be guarded, so as to prevent inadvertent contact with people [610.21(A)]. Bridge contact conductors must be guarded if you can’t prevent contact with people by dint of where you locate them.

Any wires used as contact conductors must be secured at the ends, using approved strain insulators. You must also mount them on approved insulators, making sure the extreme displacement of the wire does not bring it within less than 1.5 inches of the surface it runs over [610.21(B)]. Contact conductors must be mechanically joined to provide electrical continuity [610.21(G)] and they cannot supply other equipment [610.21(H)].

The requirements for supports depend upon whether they are along runways [610.21(C)], on bridges [610.21(D)], or for rigid conductors [610.21(E)]. These all have dimensional specifications you must meet.

You can use the track as a circuit conductor for one phase of a three-phase system, if you meet the four requirements of [610.21(F)].

« Part 1 | Source: Mark Lamendola | Mindconnection