• Transformer Secondary Conductors

    NEC 240.21 (C) states that conductors are permitted to be connected to a transformer secondary without overcurrent protection at the secondary. It further states that 240.4(B) is not permitted.  240.4(B) is for n...
    last modified by j_w_hines
  • Interpretation of NFPA 130: 2017 clause 12.4.1 & 12.4.4

    Question 1: Whether NFPA 130: 2017, chapter 12 requirements are applicable to Trainways (Metro rail Viaduct/tunnels) as mentioned under clause 12.1.1. Please confirm?   Question 2: As per NFPA 130: 201...
  • Chemical Store Protection

    I am going to design a flame detector in a chemical store so any one give me NFPA raferance.
    last modified by abrar.b
  • GFCI Below Sinks - why not?

    Anyone know why GFCIs are not required for equipment located below sinks such as in-sink waste disposers and trash compactors? I don't see a requirement in 210.8 and other sections such as 422.16(B)(1) and (2). Was cu...
    last modified by carl.mister
  • Electrical Safety Program Assistance Needed

    I need assistance from someone who specializes in electrical safety programs in a test lab environment where both technicians and engineers are working on and testing medium voltage equipment at an electrica...
    last modified by billjones12345
  • 70E Train the Trainer

    I'm new in this forum and probably this question was answered previously. Can someone recommend a class/company to train the trainer for NFPA 70E? does that person requires a certification?
    last modified by jesus.murguia
  • Working Space Requirements 110.26(C)(2)

    Hello,    We are a California Electrical Contractor and we installed a new 1200 amp switch gear section for a retail center. This was a upgrade of a existing 1000 amp switch gear section.    We a...
    last modified by corykruip
  • Does 406.12 apply to restaurant?

    Is it saying ALL the A-occupancies described in 518.2, or just the ones that are listed???   (Handbook is no help) thanks in advance.         406.12 Tamper-Resistant Receptacles. All 15- and...
    last modified by chiefns830
  • Light pole

    Hi There , I got fiber glass pole, in a parking lot , I need chance the regular light for LED, but someone said , I cant chance the all filter , just because the pole, anyone knows ,about the code , I got the NEC 2017...
    last modified by abarrantes
  • Protection of Fire Pump Feeder Circuits

    Section 695.6(A)(2) of the 2017 NEC requires conductors that connect "directly" to an on-site standby generator to comply with all of the following: (a) Independent Routing, (b) Associated Fire Pump Loads (c) Protecti...
    last modified by ron.bethea
  • NFPA-79 Wire Color Code

    The NFPA-79 Wire Color Code is important for any person to quickly identify Circuits.  Consequences of using the wrong Wire Color could be lethal.   The NEC calls out (3) Colors:      * ...
    last modified by rcramereleceng
  • I am trying to apply Table 130.7(C)(15)(A)(a) of NFPA 70e

    I am trying to apply Table 130.7(C)(15)(A)(a) of NFPA 70e to my scenario.  I need to open hinged covers on a control cabinet to reset faults on VFD's occasionally.  These control cabinets usually have 480V c...
    last modified by brian.calvert
  • Listed Equipment Installation

    I am installing milling equipment in a flour mill in the United States but the manufacture of the equipment is European and the equipment itself does not have a Nationally Recolonized Testing Laboratory label on it.&#...
    last modified by bscott.contracting
  • NEC 250.122B EGC Size

    I am trying to understand what base size we are supposed to use when we need to proportionally increase the size of the Equipment Grounding Conductor (EGC) per NEC 250.122B. Let’s say the following scenario: Bre...
    last modified by rafis
  • Supply to Fire Alarm and Protection Panels

    Greetings,   I'm looking to confirm that supply branch circuits to fire alarm and protection panels can be run in raceways with other plant wiring, and need not be segregated. I'm looking at NEC Article 760, an...
    last modified by stepandmit
  • Electrical Panel Lexan Covering Exposed 480VAC

    I worked for 24 years at General Motors and it was common to see exposed 480VAC in electrical panels covered with Lexan glass to prevent accidental contact. We performed arc flash studies and all of our panels were la...
    last modified by zz3l4b
  • Electrical Testing of Medical Equipment

    I am seeking clarification on Medical Equipment testing in Skilled Nursing Facilities. We do not admit patients that truly are  using any life support equipment so our category of risk is very low. An oxygen conc...
    last modified by rrolfe
  • Converting Dedicated 20AMP line to outlet- dishwasher replacement

    Replacing dishwasher, would like to turn dedicated 20 amp line into plug in outlet.  Do I need GFCI outlet?  What are rules on where I can place outlet?  Want to place behind stove.  Ther...
    last modified by smurfsrcute
  • Why can’t I get this GFI to trip?

     I installed a GFCI receptacle to replace an ungrounded two prong outlet. The receptacle still reads ungrounded which is expected, however when I push the test button the GFCI will not trip.   Is the device ...
    last modified by adamskimn
  • AFCI protection for mobile homes

    Not sure if this is the correct place for my question but here goes; can anyone help me to understand why AFCI protection (as outlined in 210.12) for dwelling units is not required in manufactured / mobile homes, whic...
    last modified by diverseelectric