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Motor Wiring, Part 1 Commented on: 6 days ago (April 27, 2016)

I have to disagree with pre-twisting the conductors. As an engineer, I understand that the manufacturer's engineers designed a product to work a particular way. They then tested it to ensure...

Figure it Out: Keep Your Math Skills Sharp Commented on: 5 weeks ago (March 23, 2016)

All the multi-thousand dollar software packages I have used had a software disclaimer in their license agreement, you know the thing you clicked-through to install the software. It basically says...

What Happens When Nonmetallic Sheathed Cables Come in Contact with Spray-Foam Insulation? Commented on: 8 weeks ago (March 6, 2016)

I understand your concern. However, did you read the second page of the Washington State Chief Inspector's newsletter where it mentions the research performed by the University of Toronto, which...

Tip of the Week: The Basics of Chapter 6 in NFPA 70 (NEC) Commented on: 17 weeks ago (December 30, 2015)

Actually, all the equipment listed in the last paragraph could be considered part of a group; Miscellanious, or Not Covered Elsewhere.

Electrical Troubleshooting Quiz - November 10, 2015 Commented on: 23 weeks ago (November 21, 2015)

While harmonics associated with office equipment can be a problem, having breakers trip only in the winter is a symptom of overloaded circuits due to small space heaters under the desks. I have...

Power Quality Improvements Do Save Energy Commented on: 35 weeks ago (September 2, 2015)

The NEC is all about safety from fire and electric shock as indicated in Section 90.1(B), "...contains provisions that are considered necessary for safety." Power quality issues may cause problems...

Watch Out for that Voltage Drop Commented on: 37 weeks ago (August 18, 2015)

Sparky Tom and daewizard: Would you please cite the section where voltage drop limits are required in the IECC. I have searched through both the 2009 and 2012 editions and find no mention of...

NEC: Feeder Conductors, Part 1 Commented on: 45 weeks ago (June 23, 2015)

I must take exception to two points in the article.

1. The third paragraph states the panelboard main breaker is the final OCPD and not the branch circuit breakers. That is false. The...

Overcoming Junction Box-to-Motor Mounting Deficiencies Commented on: 45 weeks ago (June 23, 2015)

Not a bad solution. Another solution could be use of cable and pin-and-sleeve plug wired into the motor junction box. The matching receptacle with appropriate disconnect switch would then be...

DOE Evaluates Potential for Wind Power in All 50 States Commented on: 47 weeks ago (June 9, 2015)

140 meter tall tower! That's 460 feet. Add in the rotor blade and we're talking about a distance above grade of almost 780 feet. Does Secretary Moniz believe residents will not have a problem with...

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