Adopts Emergency Rule for Selective Coordination
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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
210.20 Overcurrent Protection
By Mike Holt
Size branch-circuit overcurrent protection devices no
less than 125% of the continuous loads plus 100% of the noncontinuous
loads they serve. See 210.19(A)(1) for branch-circuit conductor sizing
requirements. Where the assembly and the overcurrrent protection
are both listed for 100% continuous load operation, you can size the
branch-circuit protection device at 100% of the continuous load.
However, note that equipment suitable for 100% continuous loading is
rarely available in ratings under 400A.
Protect branch-circuit conductors against overcurrent in accordance
with 240.4. Protect branch-circuit equipment in accordance with 240.3.
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
NEC? Visit EC&M's Web
site to see the answer.
Hint: Something is missing in this installation.
By Mike Holt
Q. Can Table 310.15(B)(6) be used to size
conductors for a duplex?
Web site to see the answer.
By Steven Owen
Q. When installing electric heat-tracing cables
and heating panels in industrial installations (where ground fault
indication is provided and the operation cannot tolerate a ground fault
condition that would normally open the circuit overcurrent device),
which of the following choices best meets the requirements outlined in
Art. 422 for protection of these components?
A) Ground fault protection for equipment is not required for the
heating cables and the heating panels where qualified persons service
the installation and continued operation is necessary for safe
of the equipment or process. However, the heating wires or cables must
have a grounded conductive covering.
B) GFCI protection is required for the heating cables only, and
the cables must have a grounded conductor covering.
C) GFCI protection is required for the heating cables and
D) Ground fault protection for equipment is required for the
heating cables and the heating panels, and the cables must have a
grounded conductor covering.
Web site for the answer and explanation.
Cool Electronic Cabinets
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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 literature.
Code News Update
State of Washington Adopts
Rule for Selective Coordination
In a rule-making order filed on May 31, 2006, the chief
electrical inspector of the State of Washington issued an emergency
ruling that exempts existing buildings undergoing modification or
renovation from the 2005 NEC requirements for selective coordination of
emergency and legally required standby power systems. More
the requirements for selective coordination described in 700.27 and
701.18 are not required in existing buildings or structures. However,
the portion of the emergency or legally required standby system for any
new building or structure not located within the existing building or
structure must still comply with the requirements of 700.27 and 701.18.
The reasons behind this emergency ruling were noted in the
rule-making order, which noted in part: "It was recently brought to the
department's attention that upgrading existing buildings to a
coordinated system is placing a significant economic burden on building
owners and businesses. Also, due to the increased regulatory
requirements associated with the coordinated systems, facilities such
hospitals and schools will have to be placed out-of-service for
periods of time."
The ruling goes on to say, "The emergency rule will provide building
owners and businesses financial relief from having to upgrade the
existing emergency systems without comprising public safety."
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