Grounding & Bonding Requirements
Sep 8, 2006, By Mike Holt
You basically perform work on two types of systems: solidly grounded or ungrounded. The general requirements for grounding and bonding these systems can be summarized as follows...
Code Quiz
Sep 8, 2006, By Steven Owen
What is the maximum allowable ampacity of 12 AWG THHN insulated conductors installed in a strut-type channel raceway that is 1½ inches by 1½ inches?...
Code Q&A
Sep 8, 2006, By Mike Holt
Q. I recently saw an advertisement for red conduit that is to be used for emergency circuits. Is this a Code requirement?...
Illustrated Catastrophes
Sep 1, 2006, By Joe Tedesco, NEC Columnist
As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...
Code Quandaries
Sep 1, 2006, By Mike Holt, NEC Consultant
Q. What size conductor is required for a 25-hp, 208V, 3-phase fire pump motor?...
Article 725: Around the Circuit
Sep 1, 2006, By Mike Holt, NEC Consultant
Any time you are working with burglar alarm, access control, sound, nurse call, or intercom systems, as well as computer networks, lighting dimmer controls,...
Code Quiz
Aug 28, 2006, By Steven Owen
When installing a new service for a separate building constructed on the top floor of a parking garage, it has been determined that the service conductors will have to be installed in rigid metal conduit (RMC) starting in the vault below grade of the first floor level of the parking garage...
Code Q&A
Aug 28, 2006, By Mike Holt
Q. Can “line” and “load” conductors be installed in the same raceway?...
Grounding & Bonding Definitions
Aug 28, 2006, By Mike Holt
Why is grounding so difficult to understand? One reason is because many do not understand the definition of many important terms...
Code Quiz
Aug 14, 2006, By Steven Owen
What is the maximum number of 12 AWG THHN insulated conductors permitted in a strut-type channel raceway that is 1½ inches by 1½ inches and of unlimited length?...
Code Q&A
Aug 14, 2006, By Mike Holt
Q. What type of fitting can I use to terminate ground wires in a metal box?...
Outsourcing Options
Aug 1, 2006, By Beck Ireland, Staff Writer
For the last few years, has been the buzzword in the plant maintenance world, and the numbers prove it. In 2004, consulting firm D.F. Blumberg Associates,...
Stumped by the Code?
Aug 1, 2006, By Mike Holt, NEC Consultant
Q. Can 277V circuit conductors be placed within the same raceway with 120V circuit conductors?...
Legally Required and Optional Standby Systems
Aug 1, 2006, By Mike Holt, NEC Consultant
Emergency power systems (Art. 700) are at the top of the hierarchy of backup power systems. Legally required standby systems, which fall under Art. 701,...
Illustrated Catastrophes
Aug 1, 2006, By Joe Tedesco, NEC Columnist
As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...
Code Quiz
Jul 25, 2006, By Steven Owen
What is the minimum size NM cable required for an electric space-heating branch circuit installed 3 inches above a heated ceiling (with no thermal insulation) in a dwelling unit?...
Code Q&A
Jul 25, 2006, By Mike Holt
Q. Is liquidtight flexible metal conduit (LFMC) permitted under the raised floor of a computer room? If yes, must it be secured?...
Code Quiz
Jul 11, 2006, By Steven Owen
When installing electric heat-tracing cables and heating panels in industrial installations (where ground fault alarm indication is provided and the operation cannot tolerate a ground fault condition that would normally open the circuit overcurrent device)...
Code Q&A
Jul 11, 2006, By Mike Holt
Q. Can Table 310.15(B)(6) be used to size service conductors for a duplex?...
Illustrated Catastrophes
Jul 1, 2006, By Joe Tedesco, NEC Columnist
As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without...
