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Electrical Troubleshooting Quiz - November 10, 2015 Commented on: 3 days 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: 12 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: 14 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: 22 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: 22 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: 24 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...

NEC: Branch Circuit Conductors, Minimum AWG, Part 2 Commented on: 27 weeks ago (May 20, 2015)

Third paragraph, third sentence: the OCPD is to be 40A MINIMUM, not maximum [see Sec. 210.19(A)(3)].

NEC: Branch Circuit Conductors, Minimum AWG, Part 1 Commented on: 28 weeks ago (May 8, 2015)

In the last paragraph, did you mean to say, " 125% of the continuous load"?

Tip of the Week: Practicality Forms the Basis of NFPA 70E Commented on: 29 weeks ago (April 29, 2015)

PLC Training - Good Point: 70E is the minimum starting point for "...practical safe working area..." regarding electrical work. One can and should improve upon the requirements in 70E however and...

Secrets of the Code-Making Process Commented on: 40 weeks ago (February 16, 2015)

Thank you Krista for another brief, but excellent explanation about a source of many misconceptions in our industry. Something I have been told and did not notice was that the proportion of any...

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