250.122 -- Sizing Equipment Grounding
Washington State Set to
Incorporate 2005 NEC
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Top 2005 Code Changes
250.122 -- Sizing
Equipment Grounding (Bonding) Conductors
By Mike Holt
This new rule describes how the equipment grounding
(bonding) conductors for feeder taps are to be sized. (Note:
text has been paraphrased.)
What the Code says:
Taps. 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
(Text new to the Code is underlined.)
Behind the change: For a ground fault or a short circuit in a
tap, the equipment grounding conductor must be capable of carrying the
fault current to open the feeder overcurrent device. In cases where a
tap was connected to a feeder, the rule for sizing the equipment
grounding conductor (if one was necessary) was unclear. Such
were covered by 250.122(A) to a degree, but the wording could lead to
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Hands Off, Handyman
I was called to hang two ceiling fans in a newly
renovated apartment because the apartment complex's handyman had
received a shock from the wiring despite having turned the breaker off.
The renovation had included changing the devices from ivory to white,
and during the swapout the handyman had replaced a three-way switch
a single-pole. Not knowing where to attach the "hot" wire, he chose the
only available screw -- the ground screw. The panel had no ground bond
and a loose connection to the driven ground at the remote service
entrance, so the isolated apartment ended up with an energized ground
circuit. The only way to avoid shock would have been to de-energize the
100A main to the apartment. As a result, I had to completely rewire the
complex from the service to the individual panels.
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What's Wrong Here?
By Joe Tedesco
How does this
installation violate the NEC?
Hint: Maybe the electrician was in a hurry to get temporary
power to this building.
By Mike Holt
Q. What outlets in a dwelling unit are required
to be AFCI protected?
See the answer.
By Steven Owen
In an industrial installation, 5kV rated,
multi-conductor, interlocked, armored, tray-rated cables are installed
in cable trays as branch-circuit conductors for motors operating at
4,160VAC. What requirement, if any, is there for shielding these
individual conductors within the multi-conductor cables?
- The individual conductors shall have an ozone-resistant
insulation, shall be insulated for the proper voltage, and shall be
- Must have minimum insulation rating of 600V
- Must have minimum insulation rating of 173%
- No requirement
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Code News Updates
Set to Incorporate 2005 NEC
While some states are still using a pre-21st century
edition of the Code, Washington is already planning to move beyond the
2002 NEC. More than six months after asking area contractors for
suggested revisions to its electrical installation and licensing rules,
the Washington Electrical Department has begun the process of adopting
the 2005 Code into the Washington Administrative Code. An electrical
advisory committee met last November to review change proposals that
covered everything from industrial equipment certification to in-ground
handholes and enclosures. The new Code is tentatively scheduled to take
effect June 30. For more information, visit Washington Electrical
Follow the Leader
Washington state has already announced it will adopt
2005 NEC this year, but it could be years before some states follow
suit. Without a means of mandating the Code on a national level, it's
to the states or city officials to decide when they adopt the latest
these groups be more proactive in keeping up with the Code? Visit EC&M's Web site to tell us.
Not everyone can balance working hard with playing hard, but
CodeWatch readers who plan on attending necforum in Las Vegas this
spring seem confident they can. While the majority of you say you're
going to the conference for the technical sessions, nearly as many of
you are looking forward to cards and comped drinks. Just don't stay up
too late because those technical sessions start at 8 a.m.
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