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Preparing for the Wisconsin Electrical Journeyman Exam

To help you prepare for the Wisconsin Journeyman Electrician Exam, we’ve gathered some information on what you can expect on the exam — plus some tips to help you pass.

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Most Recent

  • How to Prepare for the Washington Electrical Exam

    Before you become a journey-level or master electrician in Washington, you must pass an exam. Here’s what you can expect on the exam and some tips to help you pass.

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  • How Electricians Can Make Money Installing EV Charging Stations

    Tap into the growing demand for electric vehicle charging stations to increase your income and reach new customers as a licensed electrician.

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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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  • 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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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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