• NFPA 70 700.16  Egress Lighting

    Hi, My question is in regards to the second paragraph of 700.16 which states:   "Emergency lighting systems shall be designed and installed so that the failure of any individual lighting element, such as the bur...
    vmazzeffi
    created by vmazzeffi
  • 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...
    j_w_hines
    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...
  • Determine available arc fault value

    I am currently supporting development of a contractor electrical safety program w/ implementation of NFPA 70e. My question is regard determination of  Fault Current (Available) in order to satisfy the use of...
    tdotts
    last modified by tdotts
  • Chemical Store Protection

    I am going to design a flame detector in a chemical store so any one give me NFPA raferance.
    abrar.b
    last modified by abrar.b
  • DTM- Safer smoke alarms

    The history of innovation is full of examples that cause unwanted damage. As cultural theorist Paul Virilio said: "When you invent the ship, you also invent the shipwreck."   Fortunately it has not been the case...
    carretero110
    created by carretero110
  • Readily Accessible... in a cabinet?

    Would a GFCI outlet in a cabinet be considered readily accessible?  Our local AHJ is saying no because homeowners will more than likely place items under the sink in front of the outlet.  We do not understan...
    lloyd.abentroth
    last modified by lloyd.abentroth
  • 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...
    carl.mister
    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...
    billjones12345
    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?
    jesus.murguia
    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...
    corykruip
    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...
    chiefns830
    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...
    abarrantes
    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...
    ron.bethea
    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:      * ...
    rcramereleceng
    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...
    brian.calvert
    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.&#...
    bscott.contracting
    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...
    rafis
    last modified by rafis
  • NFPA 110 7.2.2

    In regard to NFPA 110 paragraph 7.2.2. I have a hospital facility that has an open roof equipment yard that contains the EPS as well as an air cooled chiller and chilled water pumps. The EPS is located in its own encl...
    stella
    last modified by stella
  • 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...
    stepandmit
    last modified by stepandmit