• that establishes nfpa -20 on the electrical supply of the controller for fire pump on the top or the lateral supply of the controller. can you clarify what the nfpa says about it

    that establishes nfpa -20 on the electrical supply of the controller for fire pump on the top or the lateral supply of the controller. can you clarify what the nfpa says about it
    created by mildnern
  • Per NFPA 70E 130.2(B) Energized Work Permit if you deenergize the breaker in a bucket and the only power left is the incoming from the stabs to the top of the breaker is the work permit required?

    Also if you have multiple VFD's in one cabinet and you are changing one but the rest are powered up would a wok permit be required?
    last modified by kris.mcquiggan
  • Absence of Voltage Testing

    According to the NFPA 70E, when are noncontact test instruments permitted to be used to verify absence of voltage in circuits less than 1000 volts? 
    Steve Benton
    created by Steve Benton
  • Calculating Arc Flash PPE Tables

    Referring to NFPA 70E Table 130.7(C)(15)(A)(b) - Where is there more info, step-by-step, on how to go through the process in this table? I can't find any links and there's nothing in the annexes for this. I would hope...
    last modified by ral@livelinesafety.com
  • Electrical Equipment Labeling- QR Code

    Imagine being asked to have a look at a piece of equipment that is having some issues or perhaps you might just be doing periodic maintenance and inspections. The equipment could be any number of types but I’ll ...
    Steve Benton
    created by Steve Benton
  • Sheathing Question for 220

    Where in the codes doe it state what kind of sheathing is required for wiring through floor joists?  I am going to pick a wire to run 220.  I assume that single wires coated with plastic is not to code, when...
    last modified by directionalism
  • Line side/Load side versus Bus side/Line side

    Does anyone know the history and where (if one exists) for the official definition of "Line Side" and "Load Side"?   Countless standards such as the NFPA 70 (NEC), 70E, IEEE 1584, C37.20.2, and even electric equ...
    last modified by george.cole
  • If we install air aspirating system then there is no need of infra red beam detectors as per standard?

    We have oil rig Manufacturing warehouse of  length 128.12 , width 62.82 and height 13 meters,contractor  has proposed vesda  air aspirating  system, saying that if we install  air aspirating d...
    last modified by maqsoodasif17
  • When are grounding clusters part of LOTO?

    What has been proposed is to install the ground clusters with a key attached and the lock that key fits installed on the LOTO point.  This is in addition to the LOTO for the job.  The purpose is to remove th...
    last modified by mlove
  • Electric Griddle info.

    Hello, my company is promoting a function and we have 4 electric griddles similar to the George foreman type.  I was trying to find information on what gage extension cords are needed spanning a length of 75-100 ...
    last modified by troy.cornett
  • Hubble Plug prob testing

    Hubble Plug Testing.    I have a customer that currently uses a standard probe to test a 220 Hubble (water tight) plug that has been wired in by an electrician at the box/panel.  They are testing ...
    last modified by todd.lalley
  • NFPA 70 for deep well pump application Class 1 Division 2

    I have a project that takes storm water (not sewage) via gravity flow into an underground storage system (all debris has been removed prior to entering storage). This water will be treated via recirculation using...
    last modified by jalmaraz
  • 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
  • Installation of Fuse Boxes or Main Breaker Panels

    Is it necessary, based on the NFPA standards, to have a cover on any fuse box or main breaker panel where the electrical components are hidden behind the metal panel but the horizontal switches are exposed?
    last modified by ctuzzolo
  • Does anyone know when NFPA changed the requirements of inspecting/testing electrical safety rubber gloves  from annual to every 6 months?

    Referring Specifically to Table 130.7(C)(7) Rubber Insulating Equipment, Maximum Test Intervals. If someone could explain what if means by every 6 months because I see that it says every 12 months as well.&#...
    last modified by micmac093@gmail.com
  • 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
  • How often should an Arc Flash  Analysis Survey be updated?

    How often should an Arc Flash  Analysis Survey be updated?
    last modified by dlowes
  • 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
  • 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