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  • August 8, 2018

    Hi Charlie, I am a third party independent electrical inspector in Northern New York State. I was in a local building supply store and I was talking to a store sales person who works the electrical supply section. He was explaining that installers are selection inspectors in my area based upon the application of certain provisions of the NYS Building Code and the 2014 NEC, specifically the requirement to install a four wire feeder between a service entrance pedestals and a single Family Dwelling located remotely. Am I wrong in requiring a 4 wire feeder between a service entrance pedestal and a single Family Dwelling located remotely from the service pedestal? Thank you for your time and I love reading your responses to the many code questions. Don
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  • August 7, 2018

    Re: CQD answer published Friday, July 27, 2018 -120 volt ungrounded systems Hummmmmm….. But what about an isolated power system? Matthew Hermanson
    View Question & Answer

  • August 6, 2018

    We have exhaust fans on the roof of the hospital and currently have liquidtite flex connecting them to a disconnect. These fans have a lot of vibration in them causing the conductors to rub on the metal flex inside of the flex causing them to short out and burn the wire into. Is it against code for carflex be used on this application to stop these failures from happening? Michael Essary
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  • August 3, 2018

    According to my local electrical inspector in Bellwood Illinois he claims he follows 2012 NEC and he says it states all outdoor meter sockets and risers must be anchored in the MOTER between the bricks'. No drilling anchors directly into the brick such as tapcons or lag shields which I find totally nuts!..i was inspector myself years ago and electrician 37yrs...never heard of this ridiculous code....is it true? Frank Perlongo
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  • August 2, 2018

    I have an architectural drawing showing a janitors closet with electrical panels and a slop sink. You must walk by the panels to access the slop sink. I am asking the design team to make two separate rooms. I am using code art 110.11,110.21(B)110.26(a);(1);(C) and 110.27 (B);(C) as my basis for judgment. The electrical engineer disagrees saying the room is not an electrical room, your thoughts would be greatly appreciated. Scott
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  • August 1, 2018

    In regards to the changes in the NEC 2017 regarding conduits and dissimilar metals. I work in the bakery industry which uses a lot of stainless steel panels and aluminum rigid conduit due to the multiple washdowns that most of the equipment used receives. This is common practice. How is this affected by these codes changes on new installs? Larry Ledford
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  • July 30, 2018

    I am going to wire a new house in a city I have not worked in before. The city electrical inspector told me the Meter Base Disconnect is optional even with the distance between the meter base and the load center being located 40 feet from each other. Does the NEC not require a disconnect be located outside connected to the meter base if the load center is located that far from the meter base? David Bair
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  • July 27, 2018

    I recently discovered a service feed to an outbuilding on some family property and I'm curious if it is safe. It consists of 1" PVC conduit buried at ~24" below ground with 10/3 UF cable being used as the feeder. Is it acceptable to run UF cable in PVC conduit? Bob Gabrelcik
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  • July 26, 2018

    120V single phase will always be line to ground circuit. But if there is an available 120Volt line to line circuit in the building, is it permitted by code to be utilized regardless if the loads are light fixtures, receptacles or other general loads? Jessie Santos
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  • July 25, 2018

    Electrical Power Panel-Code for space in front of panel, over panel, Plumbing pipes over Electrical panels. Jeff Teeter
    View Question & Answer

  • July 24, 2018

    Re: CQD answer published Thursday, July 12, 2018 -NM Cable in Fire Rated Construction 1) Steve should also be aware that the Massachusetts Electrical Code has amendments for the use of type NM cable 2) What code section prohibits the use of NM cable in fire rated construction? 334.10 does not limit the use to only nonrated construction. See NEC 334.10 #3. All that is required is a 15 minute finish rating which is not even 1/2 inch drywall. Fire stopping/caulking manufacturers actually have details showing electrical cables of all types in their fire rated penetration detailing. Please clarify where this is in the code. Thanks, Matt Varvel 3) BAD ANSWER, Joseph Hertel
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  • July 23, 2018

    A 12" deep panel is flush mounted in a 8" block wall (Question #1: Allowed?). In the opposing room, there are (2) 6" conduits mounted to strut that has been fastened to the rear 4" of the panel that is sticking out of the wall, which leads to Q2, is mounting the strut to the back of the panel allowed? I found no such information on panels that stick through walls in the NEC, except possibly not a neat and workmanlike installation (110.12). Thank you. John Kreider
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  • July 20, 2018

    I am making so cord drops to machines in my factory mounting boxes on the ceiling how far can I go from the box horizontally before securing for the horizontal to the machine please give code reference Micheal Jansen
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  • July 19, 2018

    Re: CQD answer published Wednesday, July 11, 2018 -Swimming Pool Junction Boxes The following is from UL 1241: A junction box shall have provision for the connection of any equipment grounding conductor in the range of 1.3 - 5.3 mm2 (16 - 10 AWG) inclusive. A junction box intended for use with a low-voltage luminaire may be marked "Suitable For Use With A Low-Voltage Luminaire." Jeff Fecteau Senior Regulatory Engineer, UL LLC
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  • July 13, 2018

    A 12" deep panel is flush mounted in a 8" block wall (Question #1: Allowed?). In the opposing room, there are (2) 6" conduits mounted to strut that has been fastened to the rear 4" of the panel that is sticking out of the wall, which leads to Q2, is mounting the strut to the back of the panel allowed? I found no such information on panels that stick through walls in the NEC, except possibly not a neat and workmanlike installation (110.12). Thank you. John Kreider
    View Question & Answer

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ABOUT CQD: The Code Question of the Day (CQD) is NECA and ELECTRICAL CONTRACTOR Magazine’s flagship National Electrical Code (NEC®) public forum for the industry, sponsored by EATON. The daily distribution of Q&A generates a lively dialogue and shares relative Code-based practical responses.

SUBMIT YOUR CODE QUESTION: Click here to submit a question to for inclusion in an upcoming edition of the Code Question of the Day, or email codequestion@necanet.org. 

CHARLIE TROUT: Charles M. Trout, better known as Charlie, was a nationally known NEC® expert and author. He served on several NEC® technical committees and is past chairman of CMP-12. In 2006 Charlie was awarded the prestigious Coggeshall Award for outstanding contributions to the electrical contracting industry, codes and standards development, and technical training. Even though Charlie passed away in October of 2015, his work continues in spirit. NECA continues to maintain this question forum for its many subscribers in memory and recognition of all his significant contributions to making the NEC what it is today.

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IMPORTANT NOTICE: Unless the question requests a response based on a specific edition, all answers are based on the latest edition of NFPA 70® National Electrical Code®.

This correspondence is not a formal interpretation of the NEC® and any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, the NEC Correlating Committee any Code-making panel or other electrical technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services. 

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