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Cranes and Hoists, Part 2

Cranes and Hoists, Part 2

Contact 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 […]

Cranes and Hoists, Part 1

Cranes and Hoists, Part 1

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, […]

Neon Signs and Lighting, Part 7

Neon Signs and Lighting, Part 7

We noted in Part 6 that the the power supply for an LED sign illumination system is a class 2 power supply. On the load side of this power source, you must use listed Class 2 cable that complies with Table 725.154, and its conductors can’t be smaller than 22 AWG [600.33(A)]. The following requirements […]

Neon Signs and Lighting, Part 6

Neon Signs and Lighting, Part 6

LED lighting systems provide many advantages for a variety of applications. Among those is sign illumination systems. It’s common to encounter secondary circuit voltage exceeding 1,000V in neon systems. But an LED typically runs on 5V. This has implications for installation requirements, which is why Article 600 has special requirements just for LED sign illumination […]

Neon Signs and Lighting, Part 5

Neon Signs and Lighting, Part 5

Neon secondary circuits over 1000V have stringent requirements for conductor separation. You must leave at least 1.5 inches between each of these conductors, and between any of these conductors and all objects (other than insulators or neon tubing [600.32(F)]). You must use insulators and bushings that are listed for use with neon secondary circuits over […]