Mike Holt

How Much Working Space Is Enough? 3
In order to create safe working conditions, OSHA and the NEC provide working space requirements that vary according to the hazards involved with
Stumped by the Code? 5
Q. What are the NEC requirements on the use of the white wire for the ungrounded conductor?
Code Q&A
Q. Can a junction box contain both 277V and 120V conductors?
Code Q&A
Q. We had a new swimming pool installed at our house, and the electricians ran a cable to the pool equipment room panel. Is this legal?
Stumped by the Code?
Q. Is GFCI protection required for receptacles above the counter of a break room in an office building?
Code Q&A 1
Q. Can a 45 kVA transformer be installed in the ceiling space above the ceiling grid?
Code Q&A
Q. What is the maximum height that a safety switch can be installed?
Box Fill Calculations 6
Box fill isn't just the number of wires in the box — it's the total volume of the conductors, devices, and fittings in a box.
Code Q&A
Q. How do you size the ground wire when running conductors in parallel?
Code Q&A
Q. Our utility requires a nonfused disconnect upstream of the meter and service disconnect for certain services. Is this legal?
Sizing Junction Boxes 15
The sizing requirements for pull boxes, junction boxes, handhole enclosures, and conduit bodies exist to prevent conductor insulation damage. Those requirements
Code Quandaries
Q. I have a 1,200A, 480V panel that has a working space of 3½ feet. The engineer says 7 feet is required. Is he correct?
Code Q&A
Q. We have motors that are interlocked, preventing them from being on at the same time. Do we still have to add them up for service and feeder calculations?
Code Q&A
Q. Is a disconnect required to be within sight of electric space-heating equipment if the unit has a factory-installed circuit breaker?
Code Quandaries | September 2008
Q. What are the requirements for installing fixtures in a bathroom?
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