Grounding (Bonding) of Communications Systems
NEC Report on
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Top 50 NEC Rules
Grounding (Bonding) of Communications Systems
By Mike Holt
An accessible bonding point must be provided at service
equipment or the disconnecting means of separate buildings or
for communications systems. The point can be any one of the
The bonding of all external communications systems to a single point
minimizes the possibility of damage to the systems from potential
(voltage) difference between the systems.
- An exposed, nonflexible metallic raceway.
- An exposed grounding electrode conductor.
- An external connection approved by the authority having
FPN No. 2: Communications systems must be bonded together.
- Antennas / Satellite Dishes (810.21)
- CATV (820.100)
- Telephone Circuits (800.100)
Editor's note: This information was extracted from Mike
the National Electrical Code
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What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the
Visit EC&M's Web
site to see the answer.
Hint: Full service door
By Mike Holt
Q. I'm running a 4-wire lighting circuit with a
shared neutral. Can I use three single-pole breakers without handle
Web site to see the answer.
By Steven Owen
Q. Where a surge arrester is installed on a
circuit operating at less than 1,000V, it shall comply with all but
which of the following?
- The rating of the surge arrester shall be equal to or greater than
the maximum continuous phase-to-ground power frequency voltage
at the point of application.
- The surge arrester shall be identified for the application.
- Surge arresters shall be marked with short-circuit current rating
and shall not be installed at a point on the system where the available
fault current is in excess of that rating.
- Surge arresters shall not be installed on ungrounded systems,
impedance grounded systems, or corner grounded delta systems unless
listed specifically for use on these systems.
Web site for the answer and explanation.
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Code News Update
NEC Report on Comments
The 2007 NEC Annual Revision Cycle Report on
Comments will be made available a week from this Friday, on March
23. You can download the file from the NFPA
See something in the report you're not too happy with? You can
file an amending motion on the technical committee report by submitting
a Notice of Intent to Make a Motion by the deadline of May 4, 2007.
Certified motions that receive notice of proper Amending Motions will
presented for action at the annual meeting to be held June 3-7, 2007 in
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