Comments Feed

Secrets of the Code-Making Process Commented on: 2 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...

Equipment Grounding Conductors and Voltage Drop Commented on: 2 weeks ago (February 16, 2015)

Did a fast check and could not find an alternative for an inadequately sized EGC in Type MC cable other than using cable tray as the EGC as allowed by Sections 250.118(11) and 392.60.

Then...

NEC: Grounded Conductors, Part 1 Commented on: 9 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: 10 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: 14 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: 14 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: 22 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: 25 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: 33 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: 33 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...

Electrical Testing Feed

EC&M Learning Center

Connect With Us

Sponsored Introduction Continue on to (or wait seconds) ×