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The designations "National Electrical Code” and “NEC” refer to the
National Electrical Code®, which is a registered
trademark of the
National Fire Protection Association.
Top 50 NEC Rules
By Mike Holt
A supplementary electrode is an electrode that is not
required by the NEC. This electrode is not required to be bonded to the
building or structure grounding electrode (earthing) system. In
addition, the supplementary electrode is not required to be sized to
250.66, and is not required to comply with the 25-ohm resistance
requirement of 250.56. However, the earth cannot be used as an
ground-fault current path as required by 250.4(A)(4). Because the
resistance of the earth is so high, very little current will return to
the electrical supply source via the earth. If a ground rod is used as
the ground-fault current path, the circuit overcurrent protection
will not open, and metal parts will remain energized.
It's important to note that the requirements contained in 250.54 for
a "supplementary" electrode should not be confused with the
contained in 250.53(D)(2) for the underground metal water pipe
"supplemental" electrode. Typically, a supplementary electrode serves
useful purpose. In some cases, it may actually create equipment or
performance failure. However, in a few cases, the supplementary
electrode is used to help reduce static charges on metal parts. For
information on protection against static electricity in hazardous
(classified) locations, see NFPA 77, Recommended Practice on Static
Fluke 1735 Three-Phase Power Logger
Power quality logging, electrical load studies and energy consumption
testing. The Fluke 1735 Power Logger is the ideal electrician or
technician's power meter for conducting energy studies and basic power
quality logging. Set the Power Logger up in seconds with the included
flexible current probes and color display. The power quality meter
measures most electrical power parameters, harmonics, and captures
voltage events. www.fluke.com/1735Codewatch
What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the
NEC? Visit EC&M's Web
site to see the answer.
Hint: If it works, it's not a problem, right?
By Mike Holt
Q. Can I install a panel in a residential
bathroom? What about in a bedroom?
Web site to see the answer.
By Steven Owen
Q. The wiring of each mobile home shall be
subjected to a ____ minute, ____ volt dielectric strength test (with
all switches closed) between live parts (including neutral) and the
mobile home ground. Alternatively, the test shall be permitted to be
performed at ___ volts for ___ second(s). This test shall be performed
after branch circuits, luminaires (fixtures), and appliances are
A) 10, 240 and 550, 10
B) 5, 480 and 600, 2
C) 1, 900 and 1,080, 1
D) There are no required tests for mobile homes, RVs, or any
Web site for the answer and explanation.
One-touch automated design and one-touch automated protective device
coordination options available in EasyPower 8.0 will be introduced in
the Hands-On training in Houston, TX FEBRUARY 5 -- 9, 2007!
Streamline the implementation of your Arc Flash and Electrical Safety
Program. What used to take hours, now takes mere seconds! EasyPower
delivers Windows® -based tools for designing, analyzing,
and monitoring electrical power systems.
Code News Update
Code Committee Call-Up
Got some extra time on your hands? Looking to put some
of your vast knowledge of the electrical field to use? NFPA is looking
for new members for several of its committees, including the
Anyone interested in serving can download the application form at NFPA's Web
- Committee on Electrical Equipment in Chemical Atmospheres. This
committee is responsible for NFPA 496, Standard for Purged and
Pressurized Enclosures for Electrical Equipment; NFPA 497,
Recommended Practice for the Classification of Flammable Liquids,
Gases, or Vapors and of Hazardous (Classified) Locations for Electrical
Installations in Chemical Process Areas; and NFPA 499,
Recommended Practice for the Classification of Combustible Dusts and
of Hazardous (Classified) Locations for Electrical Installations in
Chemical Process Areas
- Committee on Electrical Equipment of Industrial Machinery (seeking
members in all categories except end users or manufacturers). This
committee is responsible for NFPA 79, Electrical Standard for
- Committee on Electrical Systems Maintenance (special experts
excluded). This committee is responsible for NFPA 73, Electrical
Inspection Code for Existing Dwellings.
- Committee on Health Care Facilities -- Electrical Systems. This
committee is responsible for chapters within NFPA 99, Standard for
Health Care Facilities
Cool Electronic Cabinets
EXAIR's low cost Cabinet Coolers stop electronic control downtime due
heat, dirt and moisture. UL Listed Cabinet Coolers produce 20 degree
Fahrenheit air from an ordinary supply of compressed air to cool
electrical controls. Thermostat control minimizes air usage. Maintains
the NEMA 4, 4X (stainless steel) and 12 rating of the enclosure. Web
site offers detailed information, downloadable drawings and PDF
Shows and Events
Get In-Depth Information on Code
Changes & Standards
Are you a residential, industrial, commercial, or
institutional electrical contractor? Do you specify equipment or review
construction plans? Do you maintain electrical systems in a facility?
you answered "yes" to any of these questions then you have to make
to attend the Electric West conference program next year in Long Beach,
Calif. Attend one of 12 fact-filled seminars, three of which offer
Or make plans to attend one of two update sessions on the 2005 NEC, led
by top trainer Mike Holt. These Code sessions will also offer a sneak
preview of proposed changes to the 2008 NEC. Check
out this event's 40+ seminars and make plans to meet 200+ leading
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