Mike Holt

Mike
Holt
Articles
Top 50 NEC Rules
Aluminum grounding conductors cannot be in contact with earth, masonry, or subjected to corrosive conditions. When used outdoors, the termination to the electrode must not be within 18 inches of earth. Where exposed, grounding electrode conductors ...
Code Q&A
Q. How do I size the circuit conductors and protection device for a 25-hp, 208V, 3-phase fire pump design letter B motor if not supplied by an on-site generator? A. The fire pump motor circuit overcurrent protective device must be sized to carry ...
Code Q&A
Q. What are the NEC requirements for using electrical metallic tubing (EMT) to physically protect NM cable? A. For one, a nonmetallic bushing or adapter must be installed at the point where the cable enters the raceway . In unfinished basements, the ...
Article 800: Communications Circuits
Because Art. 800 has its roots in telephone technology, it addresses telephone and related systems that use twisted-pair wiring. The telephone utility
Code Q&A 1
Q. Can I install a panel in a residential bathroom? What about in a bedroom? A. The NEC does not permit overcurrent protection devices to be located in the bathrooms of dwelling units, or guestrooms/guest suites of hotels or motels . However, nothing in ...
Code Q&A
Q. Can Table 310.15(B)(6) be used to size service conductors to a duplex, where there is no firewall separating the units? A. No. Table 310.15(B)(6) only allows a reduced-size service and feeder conductors for individual dwelling units of one-family, ...
The Ins and Outs of Optical Fiber Cable Installation
Several factors are driving the popularity of optical fiber cabling. Chief among those is the growth of high-tech applications that require the massive
Stumped by the Code?
Q. Do I need to use hospital-grade receptacles in a chiropractor's or medical examining room?
Code Q&A
Q. What are the limitations on the use of rigid nonmetallic conduit in an underground application serving a gasoline dispenser?
Code Q&A
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?
Fire Alarm System Facts 5
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
Code Quandaries
Q. How far away must I locate a receptacle outlet from a shower or bathtub?
Top 50 NEC Rules
(A) Grounding Electrode. To provide a path to earth for lightning, each building or structure must have its disconnecting means grounded (earthed) to one of the following electrodes : Underground metal water pipe Metal frame of the building or ...
Code Q&A
Q. Do I have to use bonding jumpers around listed reducing washers?
Grounding and Bonding of Separately Derived AC Systems
A separately derived system is a premises wiring system with no direct electrical connection to conductors originating from another system . All transformers, except autotransformers, are separately derived because the primary circuit conductors do not ...
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