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2023 NEC Section 210.8(B): GFCI Protection, Other Than Dwelling Units

These are some updated code changes and exceptions in section 210.8(B), which covers GFCI rules for personnel, other than dwelling units.

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Most Recent

  • The De-Centralized Central Station

    This blog discusses the sustainability of central alarm stations hiring remote workers and the pros and cons that come with remote vs. in-person work.

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  • Rethinking Business Security for the New Normal

    A new security study found that physical security incidents keep growing year over year, and businesses are struggling to keep up and stay secure.

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  • 2023 NEC Section 210.8(A)(5): GFCI Protection for Basements

    Here are some important 2023 NEC changes made to 210.8(A)(5), which covers rules for GFCI outlets in basements.

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  • 2023 NEC Section 210.8(A)(7): GFCI Protection for Areas with Sinks and Food Preparation

    Here are the 2023 NEC changes made to Section 210.8(A)(7), which covers rules for GFCI outlets near areas with sinks.

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Derating Current-Carrying Conductors for Conditions of Use

If you ask a seasoned electrician how many No. 12 AWG conductors will fit into a 3/4″ EMT conduit system, you may get a response such as “one more!” While this is amusing (and typically true), there are precautions that must be taken according to the NEC whenever conductors are bundled together in a raceway, cable, or even in a ditch in the earth.

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Conductor Derating on a Rooftop Made Easy

Derating conductors for the environment where they are installed is an important consideration for selecting the type and size of conductor for a particular installation.  When installing a system on a rooftop, special consideration must be given to the ambient temperature inside the wire way or conduit that contain the conductors to prevent heating beyond the rating of the insulation of the conductors.

Conductors installed in raceways on rooftops can be subject to higher temperatures than they would be just from the heating effect of solar energy absorbed by the wall of the raceway.  This effect becomes more evident when the proximity is very close to the roof or the raceway is in contact with the roof surface.

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Conduit and Cables Exposed to Sunlight on Rooftops

Anyone who has been on top of a roof on a hot summer day knows what it’s like to stand in the middle of an oven. Extreme temperatures from the sun can bake everything in sight, from shingles to appliances, and even electrical conductors and conduit.
Conductor insulation is meant to provide long lasting protection from expected heat due to the flow of electricity and normal environmental factors. However, excessive heat from solar radiation can damage conductors and cause premature failures.

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