Grounding Electrode Conductor Installation
It's Time to Hit
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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
Grounding Electrode Conductor Installation
By Mike Holt
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
Where exposed, grounding electrode conductors sized 8 AWG and
must be installed in rigid metal conduit, intermediate metal conduit,
rigid nonmetallic conduit, or electrical metallic tubing. Ferrous metal
raceways containing the grounding electrode conductors must be made
electrically continuous by bonding each end of the ferrous metal
to the grounding electrode conductor [250.64(E)]. Grounding electrode
conductors 6 AWG copper and larger can be run exposed along the surface
if securely fastened to the construction and not subject to physical
The grounding electrode conductor, which runs to any convenient
grounding electrode [250.64(F)], must not be spliced, except as
permitted in (1) through (3):
- Splicing is permitted by irreversible compression-type connectors
listed for grounding or by exothermic welding.
- Sections of busbars can be connected together to form a grounding
- Bonding and grounding electrode conductors are permitted to
terminate to a busbar that is sized not smaller than 1/4 x 2 inches,
and the busbar must be securely fastened in place at an accessible
location. Connections must be made by a listed connector or by the
exothermic welding process.
to read the rest of this article.
Editor's note: This information was extracted from Mike Holt's
the National Electrical Code.
Fluke 1735 Three-Phase Power Logger
Power quality logging, electrical load studies and energy consumption
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technician's power meter for conducting energy studies and basic power
quality logging. Set the Power Logger up in seconds with the included
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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: Is this tube blowing or sucking air?
By Mike Holt
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?
Web site to see the answer.
By Steven Owen
Q. What is the required working space for an
installation of an electric sign transformer, ballast, or power supply
located above a suspended ceiling? The location is such that it is
considered to be accessible. The equipment is securely fastened in
place, independent of the suspended ceiling grid.
A) Three feet in the direction of access, 2 feet -- 6 inches
wide, and 6 feet -- 6 inches high.
B) Three feet in the direction of access, 3 feet wide, and 3
C) 3 feet -- 6 inches in the direction of access, 3 feet wide,
and 6 feet -- 6 inches high.
D) Sufficient access and working space is all that is required
for this installation.
Web site for the answer and explanation.
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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
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
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