• Racking Breakers

    Table 130.5(C) lists "Removal or installation of CBs or switches" under any condition as "Yes" for an increased likelihood of occurrence. If a remote racker is used a withdrawable breaker, is an EEW permit required?
    last modified by wjvd39
  • My tool pouch was taken - what should I do?

    I need the pdf version of NEC just like I need my screwdriver and lineman's pliers at my right hip.  How do you feel about NFPA eliminating pdf version of 2020 NEC?
    last modified by chiefns830
  • MCM or kcmil

    Need to make a public comment, mostly in my company, but need to know, are we supposed to use MCM or kcmil. Is there a reason to NOT use KCM? What article will/does cover this?   Thank You. Jerry
    last modified by geblackburn
  • Can I utilize  a 20' vertical steel beam as down conductor?

    Can I utilize a 5/16" thick vertical steel beam as a down conductor? In order to avoid running conductor down the 20' beam, I would just bond the top and bottom of the beam.  Beam is being utilized as the down...
    last modified by otorres
  • Hot Sticks and Arc Flash

    Does the act of using a hot stick involve a likelihood of occurrence of an arc flash incident?
    last modified by npalomb
  • NFPA 15 - Rundown Time

    As per NFPA 15, when rundown is contemplated, the distance between nozzles at different levels or elevations shall not exceed 3.7m measured along the surface.  For the vertical spacing of the spray rings to the ...
    created by chong
  • 2-prong & 3-prong outlets

    I just moved into an older home where many of the outlets are 2-prong only. My brother in law says that replacing the outlet with a 2-wire GFI outlet would meet electrical code and does not require the ground wire. An...
    last modified by cpypdx
  • Testing of a non-UL certified transfer switch prototype

    Hello all!   I have designed and built an automated battery transfer switch that currently fits into a 70 AMP breaker box. The current setup is home breaker box -> Romex -> device -> Romex -> breaker...
    last modified by jeremiah
  • NFPA  70, Art 501.5 (E)

    In NFPA 70, Article 501.5(E), 1 For a Class I Division 2, Terminations - it says cables entering an enclosure required to be explosion proof shall be sealed at the point of entry.   A squirrel cage induction mot...
    last modified by dnowicki
  • Service in a close closet

    What code article prohibits a service in a close closet?
    last modified by dmoore4597
  • Worst Case Scenario Assumed?

    Greetings, When designing power supply to fire life and safety equipment, are we to assume the worst case scenario in a building/facility? Power going out and an event occurring concurrently. Hence the need for an em...
    last modified by stepandmit
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    last modified by brianjcornelius
  • 1000V Tool Test

    I send the electrician gloves and insulated hot sticks, shepherd hooks, rubber blankets and tic tracer handles in for testing.  I was recently asked about testing our 1000V insulated tools.  Can anyone tell ...
    last modified by rebecca.cameron
  • Classroom Training - Is it Instructor Led, live Interaction?

    Section 110.1 (A) item 4: Type of Training states: "The Training required shall be classroom, on the job or the combination of the two"  My question what is the definition of "classroom".  Does "classroom" ...
    last modified by rreyes
  • 210.52(B)(1) receptical outlets served

    Is 210.52(B)(1) saying the two or more 20 ampere small appliance branch circuits required by 210.11(C)(1) will supply all outlets covered in 210.52(A)? Or does shall serve all wall and floor receptacle outlets covered...
    last modified by charlesvanmeter
  • NEC 625 to include off road type lead acid vehicles charging systems

    The NEC does not have an article like 625 (electric vehicle charging system) that applies to off-road vehicles, such as electric fork-lifts and golf carts, etc. 625.2 Definitions for electric vehicle, is defined for a...
    last modified by david.heiliger
  • Electrical Safety and independent lab certifications

    Has anyone heard of QPS Evaluation Services Inc.? They are listed as a Testing, Certification Lab, accredited in USA, Canada, and internationally.   Does NFPA recognize this group as an equivalent to UL?
    last modified by kenneth.donaldson
  • New Emergency disconnect question

    I just recently installed an UG meter socket and came into a home laterally to (2) 200 amp main breaker panels.  My permit was pulled after 1/1/2020 so I totally understand the new code enforcement of having an ...
    last modified by joepeltier99
  • Can I daisy chain power strips?

    Hello, I am new to this forum/subject and would appreciate for any assistance.  I plan to install power strips in a piece of furniture.  Can I daisy chain one power strip to another strip?  I understan...
    last modified by ytfu2011
  • Commercial Outlets

    Can someone point me to the specific section of the NFPA 70 that requires 120V outlets in commercial applications to be upside down (with the ground mounted upward)?  The usual answer I get from electricians is s...
    last modified by fahrquad