• NEC 2020 not available in PDF!

    It is extremely disappointing that unlike NEC 2017 and its handbook, the NEC 2020 edition and its handbook are not available in PDF format that you can store on your computer as a digital resource and access it a...
    last modified by nikunj.shah
  • Ampacity Derating for Fire Condition 700.10

    I wanted to clarify what the designer is expected to do regarding calculations to show compliance with 310.15 (B) (2) Ambient Temperature Adjustment Factors, especially during a fire condition.   This is al...
    last modified by troyk31
  • PLC Panel 120 VAC Digital Input

    I have a #16 AWG  600 V insulation cable cable coming in from the field to the marshalling terminal with  a 120 VAC digital input to PLC. From the other side of the marshalling terminal to the PLC card wirin...
    last modified by jz2018
  • Applying Temporary grounding devices

    In table 130.5(C) The task of "Application of temporary protective grounding equipment, after voltage test." is listed as a "Yes" for Likelihood of occurrence. Does this mean an EEW permit is required?
    last modified by wjvd39
  • 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
  • Custom Temporary Power Outlet Unit

    Hello, I work in a ship yard and we're currently looking into fabricating a portable power outlet unit. Supply: 208VAC 3PH, 100A Feed: 110VAC, 1PH, Various 30A and 60A    The vendor we typically buy them ...
    last modified by joshua.burke
  • 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
  • Relocatable Power Taps

    Hi all. I keep going down the RPT rabbit hole after reviewing NFPA 1, UL 1363, UL White Book, and OSHA. I have come to the conclusion the NEC is silent on RPTs. All the references above seems to say hey, yup...
    last modified by carl.mister
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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