Before you install these systems, you better understand OSHA requirements.So you want to install a custom-made piece of equipment. But you don't know if you should - or if it's legal. Let's look at what requirements...
Last month, we looked at how to calculate various lighting loads. This month, we'll look at how to calculate receptacle and appliance loads. Let's tackle receptacle loads first.Receptacle loads. A receptacle is a...
Grounded (Neutral) Conductors - Art. 200 Choose the best answer:1. If you run one grounded (neutral) conductor in the same raceway as two ungrounded (phase) conductors, the grounded (neutral) conductor shall have an...
Industrial Calculations: Lighting Loads This is the first in a multi-part series that will cover industrial calculations for service and feeder conductors in an industrial facility. You must size each service and...
The What and Where of Service Point Locations Different interpretations of the Code have led to confusion when determining the service point for a premises. Clearing up some definitions is the first step to mastering...
Grounding - Art. 250 Choose the best answer: 1. What size copper bonding jumper (BJ) should you use to bond/ground the secondary of a separately derived system to building steel? The circuit has four No. 3/0 THWN...
Because every type of machine has unique requirements for wiring methods, operator safety depends on your understanding the differences between rules in the NEC and methods outlined in NFPA 79.Every type of machine...
Equipment for Class I Hazardous Locations The key to installing electrical equipment in any hazardous location is to prevent the ignition of its surrounding flammable atmosphere.Electrical equipment installed in...
Grounding - Art. 250 Choose the best answer: 1. In a paralleled 3-phase, 4-wire service with three 700kcmil THWN copper conductors per phase, what size grounded (neutral) conductor does the NEC require in each run?(a)...
