• How often should an Arc Flash  Analysis Survey be updated?

    How often should an Arc Flash  Analysis Survey be updated?
    last modified by dlowes
  • Custom electrical panels and UL listed

    Do custom electrical control panels for equipment have to be UL listed/ have UL components?
    last modified by mickeyd554
  • Qualified Person Documentation

    I need to document knowledge of our Qualified Persons (110.2).  Is there a tool to do that with, such as an online assessment of knowledge?
    last modified by graybat1
  • Arc Flash Label Requirements from NFPA 70E - 2015

    Does anyone have examples of Arc Flash labels that the NFPA 70E committee agree are in compliance with NFPA 70E - 2015?  We are debating the Incident Energy and Working Distance versus PPE Category requireme...
    last modified by jackson.silver@wacker.com
  • light and power circuit in same trunk

    Can i run power  circuit and light circuit in same conduit or trunk of same voltage ?
    last modified by maqsoodasif17
  • Where does 690VAC fit into NFPA 70E Table 130.7(C)(150)(a) Arc Flash PPE Categories?

    Wind turbine generators can use voltages as high as 400/690 VAC to power yaw control, ventilation, and oil pump motors.  Table 130.7(C)(150)(a) Arc Flash PPE Categories lists panel boards greater than 2...
    last modified by shrkach
  • Pull boxes penetrating walls

    Hi everyone!   We are doing a renovation project and one of our concerns is a pull box penetrating a wall. According to one of the project managers, in Japan's standards, a pull box made of a 1.6mm-thick p...
    last modified by ejlsanpedro
  • Verifying that the grounding conductor is correctly sized.

    To whom it may concern,   Good morning from Texas, I would like to verify a decision that I have made with you all. Before I go into detail, allow me to give a brief overview of what I am trying to do. I have be...
    last modified by mberzoza
  • Proper clamps to use on drop cable

    Pertaining to NEC code is it acceptable when using drop cable (SJTW) to use the trade name screw clamps. The drop cable is used with 120VAC feeding to a switch and then to 3 lights.
    last modified by gwhite
  • Employer responsibility

      I am also looking for clarification on the employer/employee responsibility of NFPA 70E.  I have been an industrial electrician for about 14 years at a manufacturing facility.  The facility has about ...
    last modified by bigwill400
  • Schoolyard Hazard

    What's wrong here?
    last modified by nec.consultant
  • Arc-flash PPE required using IP2X connector ?

    I have a battery system 800V with IP2X (fingerproof) connectors going out from the battery casing. For my battery disconnection operations, am I required to wear PPE ?  I would say 'no' since there are no bare en...
    last modified by philippe.laflaquiere
  • NFPA 70E PPE requirements?

    I run a service department that works on bakery equipment.  The machines are mainly 220 volts but some are 480 volts incoming power. We have PPE for CAT 2 (coveralls, hard hat, rubber gloves, leather gloves, face...
    last modified by escherm
  • Electrically Safety Work Condition & Increased Likelihood of Injury

    In NFPA 70E 130.2(2) it states that and Electrically Safety Work Condition must be established if "The employee interacts with equipment where conductors or circuit parts are not exposed but an increased likelihood of...
    last modified by rhogg
  • Job risk assessment

     I am an electrician in a manufacturing facility.  There is a variety of electrical work that goes on here.  There is installation, troubleshooting, testing and calibrating.  I was wondering what i...
    last modified by bigwill400
  • How to fix a vague definition and missing information in NFPA-70e?

    I'm running into problems with users of the NFPA-70e guidelines.  The problems are arising due to the poor definition of "Electrical Hazard" (page 13, Article 100, definitions) and the complete lack of informed g...
    last modified by eric.byers@cirris.com
  • How far should I place a smoke detector or a heat detector from a beam or sidewall? This is regarding dead air space.

    I was going through NFPA 72, 2016 Edition. In code A, they showed the proper mounting placement of heat detectors with the following figure.     Can I use the above image for smoke detec...
    last modified by shamilbb12
  • FR Stacking

    I have a client wishing to provide their on-site non-electrical workers with a winter FR Coat tested only to the ASTM D6413 standard (% of Synthetic vs Cotton). All workers will have ARC2 long sleeve and cargo pants o...
    created by robert.shattell
  • What Lies Ahead? NFPA 70E and Beyond

    As I look back to the beginning of 2018 and reflect on the work performed and the people that I have encountered throughout the year I would like to pause for a moment and ask myself a few questions, "Have I made a po...
    Steve Benton
    last modified by Steve Benton

    Hi All,   I am making a 3 Phase power meter using a MICROCHIP IC ATM90E36A. They recommend to use neutral wire as a GND reference to measure voltages at 3 hot legs but in my loads (Air Conditioners) there is no ...
    last modified by arshdeep