We’re excited to bring you an extract from Mike Holt’s Illustrated Guide to Electrical Exam Preparation Library to give you an introduction to the book and DVDs. As part of our ongoing effort to provide free resources to help the industry, this is our 4th in a series of newsletters that include graphics and text taken directly from a Mike Holt textbook and a video clip from the DVD program.

Watch the Video Clip!

To get the most out of this instruction, watch the video clip as you review this content. Click here or on the image to the right [duration 4:17]. Mike and the DVD team weigh in on the rule and discuss the practical impact of its everyday application.

In case you missed them, here are links to the previous newsletters in this series:

250.54 Auxiliary Grounding Electrodes

680.26 Equipotential Bonding

690.47 Grounding Electrode System

440.4 Marking on Hermetic Refrigerant Motor-Compressors and Equipment

(B) Multimotor and Combination-Load Equipment. Multimotor and combination-load equipment must have a visible nameplate marked with the maker’s name, rating in volts, number of phases, minimum conductor ampacity, and the maximum rating of the branch-circuit short-circuit and ground-fault protective device.

Author’s Comment:

The minimum conductor ampacity is calculated in accordance with 440.33 and the branch circuit short-circuit and ground-fault protective device rating is sized with 440.22(B)(1).