Cast Your Vote
Sizing Equipment Grounding (Bonding) Conductor
Don't Miss This FREE
Scheduled for May 17th in the EC&M e-Tradeshow
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Top 50 NEC Rules
Sizing Equipment Grounding (Bonding) Conductor
By Mike Holt
The equipment grounding (bonding) conductor must be
sized in accordance with Table 250.122, based on the ampere rating of
the circuit-protection device, but in no case is it required to be
larger than the circuit conductors. Equipment grounding (bonding)
conductors must be capable of safely conducting any ground-fault
likely to be imposed on them [110.10]. If the equipment grounding
(bonding) conductor isn't sized to withstand the ground-fault current,
the conductor may burn clear before the protective device responds.
When ungrounded circuit conductors are increased in size for any
reason, the equipment grounding (bonding) conductor must be
proportionately increased in size. Ungrounded conductors could be
increased in size to accommodate voltage drop, because of excessive
heating from harmonic currents, fault current studies, or future
When multiple circuits are installed in the same raceway or cable,
only one equipment grounding (bonding) conductor is required. This
conductor must be sized in accordance with Table 250.122, based on the
largest overcurrent device protecting the circuit conductors.
When circuit conductors are run in parallel [310.4], an equipment
grounding (bonding) conductor must be installed with each parallel
conductor set -- and it must be sized in accordance with (1) or
- Based on the ampere rating of the circuit-protection device in
accordance with Table 250.122.
- Based on the ampere rating of the ground-fault protection in
accordance with Table 250.122 where ground-fault protection of
is installed if:
Equipment grounding (bonding) conductors for feeder taps must be sized
in accordance with Table 250.122, based on the ampere rating of the
circuit-protection device ahead of the feeder, but in no case is it
required to be larger than the circuit conductors.
- Maintenance and supervision ensure that only qualified persons will
service the installation.
- Ground-fault protection is set to trip at not more than the
of a single ungrounded conductor.
Editor's note: This information was extracted from Mike
the National Electrical Code
One-touch automated design and one-touch
automated protective device coordination options, available in
8.0, will be introduced in the Hands-On training in Indianapolis,
Indiana on September 17-21, 2007! Streamline the implementation of
your Arc Flash and Electrical Safety Program. What used to take hours,
now takes mere seconds! EasyPower delivers
designing, analyzing, and monitoring electrical power systems.
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: You've got mail
By Mike Holt
Q. Can I connect a range hood in a dwelling unit
kitchen to the small appliance circuit?
Web site to see the answer.
By Steven Owen
Q. A contractor installed a 2,000A, 480V,
feeder in six separate raceways, consisting of a total of six 500kcmil
XHHW insulated conductors per phase. Four of the raceways are 3-inch
trade size EMT. The other two raceways are 3 1/2-inch RMC. All
conductors are exactly the same length, per paralleled phase, and
feature the same insulation type and conductor material. In addition,
all are terminated in the same manner and have the same cross-sectional
area. The inspector has turned this installation down. What could
possibility make this installation non-Code compliant?
- Nothing. This installation is Code compliant.
- The raceways are not the same. You must change all raceway sizes to
either 3 1/2-inch EMT or 3 1/2-inch RMC.
- The raceways are not the same. You must change all raceways to
either EMT or RMC of the proper trade size.
- The installation has an incorrect number of conductors paralleled.
Change the number of conductors per phase from six to five.
Web site for the answer and explanation.
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an ordinary supply of compressed air to cool electrical controls.
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(stainless steel) and 12 rating of the enclosure. Web site offers
detailed information, downloadable drawings and PDF literature.
Code News Update
According to the April 2007 issue of NEMA's
electroindustry, the California Building Standards Commission
recently announced that all pertinent state agencies have completed
their review of the appropriate model codes and have submitted their
recommendations for amendments. The new 2007 California Electrical
Code will be based on the 2005 NEC. The new code is scheduled to be
published by July 1 2007, with enforcement taking place on January 1
Shows and Events
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For additional information on the dates and locations of these
Don't Miss This FREE Live Session
Scheduled for May 17th in the
- "Understanding Ground Resistance Testing" presented by John
Olobri, AEMC Instruments, 10:00 a.m. Eastern and Pacific time
In today's rapidly changing world of technological advances, good
grounding is more important than ever to prevent costly damage and
downtime due to service interruptions and inoperative surge protection
caused by poor grounds. Attend this live conference and learn about
resistivity, ground resistance, 3- and 4-point measurements, and
clamp-on measurements. This conference is a must for professional
engineers, plant/facility electrical maintenance technicians, and
electrical contractors and field technicians. Bring Your Questions!
Before and after the conference session, visit the many exhibitors
this virtual tradeshow and take a look at the On-Demand Theater, where
you can view past online webcasts 24/7/365.
Go to http://www.ecmweb.com/etradeshow/index.html
information on accessing the EC&M e-Tradeshow and attending this
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