Code Quiz 

Oct 11, 2006, By Steven Owen

What is the proper size branch-circuit, short-circuit, ground-fault protective device required for a hermetic compressor with a nameplate rated load of 38A?...

Grounding and Bonding of Separately Derived AC Systems 

Oct 11, 2006, By Mike Holt

Code Q&A 

Oct 11, 2006, By Mike Holt

Q. If an outdoor generator has a disconnect, do I need an additional disconnect where the conductors enter the building?...

Illustrated Catastrophes 

Oct 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...

Article 725: Around the Circuit Part 2 

Oct 1, 2006, By Mike Holt, NEC Consultant

In last month's Code Basics article, starting on page 56 of the September issue, we spent most of our time discussing Class 1 circuits. Now, it's time...

Code Quiz 

Sep 25, 2006, By Steven Owen

What is the minimum size XHHW insulated feeder conductor permitted for an industrial machine, which consists of the following loads? All terminals are rated at 75°C....

Code Q&A 

Sep 25, 2006, By Mike Holt

Q. Can I use 12-3 NM cable to wire the bathroom GFCIs and laundry circuit in a dwelling?...

Top 50 NEC Rules 

Sep 25, 2006, By Mike Holt

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?...

Article 725: Around the Circuit Part 1 

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 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?...

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 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?...

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?...