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NEC: Grounded Conductors, Part 1 Commented on: 4 weeks ago (December 31, 2014)

A correction needs to be made to the last paragraph.

IEEE 142-2007, "IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems," is The Green Book.

The...

Code Quiz: Motor and Controller Disconnecting Means Commented on: 5 weeks ago (December 21, 2014)

I agree with Alan. From the information presented in the question both disconnects comply with Section 430.102. At the same time, no information was given to indicate the disconnects were or were...

What’s Wrong Here? Hint: A Service That Needs to be Serviced Commented on: 10 weeks ago (November 20, 2014)

Concerning the point of attachment:

From what I can discern from the photo I do not believe this building was resided since the service was installed. The siding shows signs of dirt and...

The Latest Generator Design Trends Commented on: 10 weeks ago (November 20, 2014)

Thank you Krista, a nice brief argument for paralleling gen-sets. I agree that many engineers of late design one unit, say 2 MW in size, to serve an entire hospital instead of multiple units, say...

What’s Wrong Here? Hint: Wide Open Spaces Commented on: 17 weeks ago (September 29, 2014)

From what I can see in the photo, the violation to cite when red-tagging this installation would be Section 314.21, which should be sufficient.

From this photo I cannot discern where the...

The 10 Worst Grounding Mistakes You'll Ever Make Commented on: 20 weeks ago (September 7, 2014)

I believe you are misunderstanding the operation of ground fault protective devices. The ground wire, and by association grounded objects, have absolutely no function regarding the tripping of...

Code Q&A: Air-Conditioner Calculations Commented on: 28 weeks ago (July 14, 2014)

From your question, I understand you are thinking of 240.4(D)(7) and the general rules for overcurrent protective device sizing. In the case of motor loads, refer to 240.4(G) and Table 240.4(G),...

Overcurrent Protection, Part 4 Commented on: 29 weeks ago (July 10, 2014)

The author was making the point that overcurrent devices are not permitted in the current path of a grounded conductor, sometimes also known as the neutral conductor, unless permitted elsewhere in...

Code Q&A: GFCIs in Unfinished Basements Commented on: 30 weeks ago (July 1, 2014)

Perhaps if you purchased GFCI devices that cost more than $6, then you may not have as many false tripping problems.

A basement where things maybe wet or damp is exactly where you NEED a...

Lightening Up on Lighting Loads Commented on: 34 weeks ago (June 2, 2014)

I agree and disagree.

I worked on a twin office tower project totaling 1,000,000 square-feet in the late 80s and was assigned to calculate the loads and fault currents. We included demand...

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