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Motor Control Centers, Part 1

Motor Control Centers, Part 1

The ampere rating (or setting) of the OCPD for a motor control center can’t exceed the rating of the common bus [430.94]. This rule sometimes creates problems in existing facilities when a production problem is solved with a larger motor, but it’s not possible to supply the motor from the existing MCC due to the […]

Electric Signs and Lighting, Part 6

Electric Signs and Lighting, Part 6

As noted in Part 5, 600.7(A) provides the “grounding” requirements but these are actually bonding requirements. This becomes clear when you read the requirements and remember that Article 100 defines “ground” as “the earth.” The first requirement we come across is that the metal equipment must be “grounded” by connection of the equipment grounding conductor […]

Retrofit Factors for Contractors, Part 4

Retrofit Factors for Contractors, Part 4

In Part 3, we discussed how you can help your customer decide on the best choice for a lighting retrofit project. That discussion focused on getting the customer into a dialogue about the problems the retrofit can solve. But the customer might not actually know about some problems that a lighting retrofit will solve and […]

An Ounce of Prevention, Part 1

An Ounce of Prevention, Part 1

Knowing where the fire exits are is a smart thing to do. But it’s even smarter to prevent fires in the first place. Many of us associate industrial fires with electrical faults. There’s a fault, there’s arcing, and then there’s fire. About 21% of industrial fires are from electrical causes. There’s quite a bit we […]

Neon Signs and Lighting, Part 1

Neon Signs and Lighting, Part 1

Neon lighting is ubiquitous outdoors. It’s bright and colorful, plus the signs can be made into many different shapes. This makes it perfect for outdoor signs, because they can be made to really stand out. But neon lighting operates at high voltage so it has its own special hazards. Thus, Article 600 devotes nearly all […]