Code Q&A 

Dec 11, 2006, By Mike Holt

Code Quiz 

Nov 27, 2006, By Steven Owen

In a Class 1 location of a spray application (Art. 516) area, portable equipment such as portable electric lamps or other utilization equipment shall be permitted in which of the following situations?...

Code Q&A 

Nov 27, 2006, By Mike Holt

Q. What are the limitations on the use of rigid nonmetallic conduit in an underground application serving a gasoline dispenser?...

Code Quiz 

Nov 13, 2006, By Steven Owen

The wiring of the emergency system in hospitals shall be mechanically protected. Where installed as branch circuits in patient care areas, the installation shall comply with the requirements of 517.13(A) and 517.13(B). Which of the following wiring methods is permitted?...

Code Q&A 

Nov 13, 2006, By Mike Holt

Q. Can Table 310.15(B)(6) (reduced size wire for dwelling unit service) be used to size the service neutral conductor for a single-family dwelling?...

AFCIs on the Brink of a Home Invasion 

Nov 1, 2006, By Beck Ireland, Staff Writer

If proposal #2-142 of the National Electric Code (NEC) passes, it will require combination-type arc-fault circuit interrupter (AFCI) protection for all...

Fire Alarm System Facts 

Nov 1, 2006, By Mike Holt, NEC Consultant

Article 760 tells us how to install wiring and equipment for fire alarm systems, including all circuits these devices control and provide power to. What...

Top 50 NEC Rules 

Oct 25, 2006, By Mike Holt

Code Quiz 

Oct 25, 2006, By Steven Owen

What is the proper size overload, and branch-circuit, short-circuit, ground-fault protective device permitted for a hermetic compressor with a nameplate rated-load of 38A, and a branch-circuit selection current of 40A?...

Code Q&A 

Oct 25, 2006, By Mike Holt

Q. Do I have to use bonding jumpers around listed reducing washers?...

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?...