The Inspection Bureau, Inc.
"Electrical Safety Since 1888"
NOTICES TO CONTRACTORS
|PANIC HARDWARE||DEDICATED SPACE||GFI RECEPTACLES|
|ARC-FAULT CIRCUIT INTERRUPTERS||HVAC RECEPTACLES||SERVICE CONDUCTORS|
|TRANSFORMER SECONDARY CONDUCTORS||CIRCUIT BREAKERS USED AS SWITCHES||GAS PIPE BONDING|
|GROUND RODS||GROUND ROD WIRE SIZE||CONNECTING EQUIPMENT GROUNDS TO BOXES|
|AIR HANDLING CEILINGS||OUTDOOR RECEPTACLES||NEUTRAL CONNECTIONS|
Dear Electrical Contractors,
As you know, there are numerous changes in the 2002 NEC and it will take some time for all of us to sort things out. I will keep new information available at our front counter and on our web site as the information is developed. For now, here are some changes that I want to share with you because a great majority of you will encounter these changes every day. I will update this list as necessary.
PANIC HARDWARE: Personnel doors in rooms with electrical equipment that
is individually rated at 1200 amperes or more shall have panic bars, pressure
plates or other devices that are normally latched but will open under simple
pressure. Art.110.26 (C)
DEDICATED SPACE: Dedicated space must be provided at all switchboard,
panelboard, distribution board, and motor control center locations. The basic
rules are the space must be unobstructed, as wide as the equipment is, and
extend from the floor to 6’ above the equipment or structural ceiling
(whichever is lower). Suspended ceiling panels are allowed in this space.
GFI RECEPTACLES: GFI protected receptacles are now also required in
kitchens in other than dwelling units. In the absence of an NEC definition, IBI
will define “kitchen” as an area with permanent provisions for sanitation
and cooking. (Note: The typical office break room with a sink and a portable
microwave oven will not be considered to be a “kitchen”.) Art. 210.8 (B)
ARC-FAULT CIRCUIT INTERRUPTERS: All branch circuits that supply outlets
in dwelling unit bedrooms shall have arc-fault circuit interrupter protection.
Art. 210.12 (Note: See Art. 100 for
definition of “outlet”.)
HVAC RECEPTACLES: All new HVAC installations now require a general use
receptacle to be located within 25’ of the HVAC equipment and on the same
level. Art. 210.8 will determine when these receptacles shall be GFI protected.
SERVICE CONDUCTORS: Underground service conductors in conduit under
building floors that are not constructed of a minimum of 2” of concrete shall
be a minimum of 18” deep to be considered as “outside of the building”.
TRANSFORMER SECONDARY CONDUCTORS: Transformer secondary conductors in
other than industrial locations are now permitted to be up to 25’ in length
without overcurrent protection at their source under specific installation
conditions. Art. 240.21(C) (6)
CIRCUIT BREAKERS USED AS SWITCHES: Circuit breakers used as switches for
fluorescent lighting shall be marked “SWD”. Circuit Breakers used as
switches for high-intensity lighting shall be marked “HID”. This rule only
applies when the circuit breaker also serves as a switch for the lighting.
9.) GAS PIPE BONDING: A separate
bonding conductor from the grounding electrode system to the interior metal gas
piping is no longer needed when there is gas operated equipment that is
connected to an electrical branch circuit. Art.250.104 (B)
GROUND RODS: The 2002 NEC does not recognize a metal underground water
pipe as a suitable “additional electrode” for supplementing a single ground
rod. If the resistance of a single ground rod exceeds 25 ohms to ground and
there are no suitable “additional electrodes” (Art. 250.56 refers you to
Art. 250.52 (A)(2) through (A) (7)), a second ground rod must be driven (at
least 6’ away). You may be required to certify the quality of your installed
grounding electrode system. If you have a “single ground rod” installation
and there are no other available electrodes, you can avoid such certification
requests by providing an additional ground rod prior to requesting an
inspection. Factors taken into consideration will be the quality of the soil,
whether or not the soil has been disturbed, whether or not the rod is driven as
opposed to being laid in a trench or next to a footer, etc. On jobs where a
building or structure containing no available electrodes is supplied by another
building, the grounding electrode (usually a ground rod) that you install will
already be supplemented by the grounding electrode system at the “first”
building via the installed equipment grounding conductor between buildings or
the bonded neutral at the “second” building. Art. 250.56
GROUND ROD WIRE SIZE: The maximum size grounding electrode conductor
required for the sole conductor to a rod, pipe, or plate electrode is 6AWG.
250.66 (A). (Note: Two rods bonded together are considered to be a single
electrode system. Art.250.58)
CONNECTING EQUIPMENT GROUNDS TO
BOXES: Unless the circuit conductors are
terminated or spliced within a box, they do not have to be bonded to the box.
Art. 250.148 (Note: Metal boxes still have to be grounded)
AIR HANDLING CEILINGS: Liquidtight Conduit is no longer approved for use
in air handling ceilings. Art. 300.22 (C) (1)
OUTDOOR RECEPTACLES: “Bubble” covers are required on all outdoor
receptacles in wet locations. Receptacles protected by the weather (beating
rain) by roofs, porches, and canopies may be considered to be in damp locations
– the actual location of the receptacle will be the determining factor.
NEUTRAL CONNECTIONS: The “doubling up” of neutrals in panelboards is
now prohibited. Art.408.21
Gaylord Poe, Chief Electrical
Certain changes in 2005 NEC 680.26 (C) have a major
negative impact on pool builders and homeowners. The costs for compliance with
the new rules are extreme and provide only a questionable proportionate increase
in electrical safety. Recently, the pool industry approached the NFPA and gained
relief in the form of a Tentative Interim Amendment (TIA) that addresses the
problems caused by the changes. It is uncertain if
IBI agrees with the
TIA and believes that the changes provided by the TIA will provide an
electrically safe installation. We also believe that there will be positive
change accomplished on this matter in the 2008 NEC.
For these reasons
IBI, with the support of and permission from the Hamilton County and City of
Cincinnati building departments and other local building officials, will refer
to NEC 90.4 (which provides, "By special permission, the authority
having jurisdiction may waive specific requirements in this Code or permit
alternative methods where it is assured that equivalent objectives can be
achieved by establishing and maintaining effective safety.") and will
recognize the TIA as an acceptable "alternative
method" for One, Two, and Three-Family Dwellings only. Please
note that IBI will recognize the TIA as an acceptable
"alternative method" for these types of structures only.
This policy will
remain in effect for One, Two, and Three-Family Dwellings only
Chief Electrical Inspector
The 2005 NEC now requires that reinforcing steel (rebar) in concrete, when
present shall be used as part
In recognition of the verbiage of 250.52 (A) (3) "An electrode
encased by at least 50mm (2 in.) of concrete, located within and near the bottom
of a concrete foundation or footing that is in direct contact with the
earth." many in the local (Cincinnati) electrical industry have began using
the following method for code compliance
In layman's terms...
This method has proven to be
a good solution to a problem. It saves trying to coordinate getting the