• 480 VAC VFD Power - Do I need an Enclosure & Disconnect?

    Hi,   I work for an equipment manufacturer.  For a machine we are building, I have a VFD for an Exhaust Blower that requires 480 VAC 3-phase 6 amps.  The VFD is designed so that it can be mounted on a ...
    last modified by pwk@kraemerkoating.com
  • 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
  • NEC 210.71

    For an existing conference room where the Architect required adding an outlet, the plan check person has required outlets as per this article, which requires quantity as in a residence.  In addition, it requires ...
    last modified by j_w_hines
  • 2017 NEC 680.7

    Does NEC 680.7 apply to factory and field installed lugs, the way I read it is the first sentence would apply to factory lugs and the second sentence would apply to field installed lugs. 
    last modified by mdemps3
  • AFCI for Dishwasher ?

    Pa started following the 2014 NEC so my questions is 1) 210.12(A) - does a dishwasher for a dwelling require AFCI protection if on a dedicated circuit (I know it needs GFCI protection) 2) same question, how about a ...
    last modified by gk1226
  • emergency ATS connected load side of optional ATS

    I am reviewing plans that specify an emergency system and a optional system, the generator has 2 breakers one for each system, but the optional system ATS is specified to be installed to re-feed the entire existing 80...
    last modified by mdemps3
  • Table 310.16 vs. Article 400 for a 3-conductor VFD cable?

    Hi,   I am working on a project in which I will be using a VFD to drive an AC motor.  For the motor power cable from the VFD to the motor, I am planning to use a cable with a braided shield that is specifica...
    last modified by pwk@kraemerkoating.com
  • Working 120v Live

    When working 120Volt Circuits live Receptacles, switches what PPE is required?
    last modified by justin.grantham
  • 240.21 feeder tap directly to utilization equipment?

    Since the 2014 edition, 240.21(B)(1)(1)(b) has allowed a 10 ft feeder tap to terminate on "equipment containing an overcurrent device" as an alternative to terminating directly on an OCPD.   I would like to conn...
    last modified by cfharr
  • qualified observer

    I have a question.  If there is a crew going out to do some  electrical maintenance. But only one member of the crew is a qualified electrician. do the other people assisting him need to have CPR and other ...
    last modified by jrendon6861
  • What is the permissible gap of an opening for a ceiling product or tile when running wires though a tile into a Ceiling that is being used as a plenum?

    There is a product that we want to install in a ceiling in a Healthcare facility and understand the requirements of firestopping for cables but what is the permissible gap for an opening to limit the spread of sm...
    last modified by safedesign1
  • 2020 NEC Definition

    I have a question on the 2020 NEC code – definition of a term.  In Article 100 (70-35)  there is a definition for “Dwelling Unit”.  It states: A single unit ….. My question is ...
    last modified by apshulick@ieee.org
  • Fire Fighting Pump Requirments

    Hi, I need fire fighting pump requirements according to NFPA please help me about it.   Thanks 
    last modified by abrar.b
  • Connect portable generator to house power?

    Hi, How can I safely connect a portable generator to supply power to a house? The house has a standby generator which no longer works, and the stator and rotor windings are completely shorted. I lease the house and...
    last modified by tgammonphd
  • Ground Tied To Neutral Bar. Please Help.

    Good Afternoon,        I have a question hopefully I can get some help on. I was troubleshooting a recepticle in co-op apartment that is not working. I went to the circuit breaker panel and when I...
    last modified by jesus.rodriguez1808
  • AFCI breakers

    Has anyone heard of any issues of AFCI breaker unavailability due to factories that shut down?
    created by chiefns830
  • How can calculate the pump head

    How can calculate the pump head. please share me method
    last modified by abrar.b
  • extension cord for appliance

    I have a office that needs to have power for a refrigerator.. Put I have only 2 options  1. run a new line to the  appliance 2. run a extension cord with a gfci..   I know i can do the first one. But...
    last modified by jrendon6861
  • NFPA 101 emergency lighting

    Hello everyone,    I am working on an emergency lighting scheme for a hospital and the client wants this to be done as per NFPA 101. I am just wondering if there's a guide that clearly shows the emergency l...
    last modified by mohamed.ehtiawesh
  • Pre-Action vs Dry Pipe air monitoring

    Pre-action vs dry pipe sprinkler systems, high and low air pressure monitoring.   I am designing a new pre-action system that is arranged for double interlock with smoke detection for activation of solenoid. I k...
    last modified by imran.malik