• A Better Understanding of NFPA 70E: NFPA 70E Equipment Labeling

    Section 130.5(H) has specific requirements for equipment labels when there are electrical hazards present. For some reason, users of NFPA 70E, Standard for Electrical Safety in the Workplace have troubl...
    last modified by ccoache
  • Means of Egress Requirements For Sewage Pump located in -44m Deep

    There is a sewage pump located in -44m deep from the LED. The pump house structure is in 35m diameter and contains 4 electric pumps (3 duty + 1 standby) and sump dewatering pump located at -44m level from LED. Each se...
    last modified by hamad.koroni
  • 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
  • Enclosure Pressurization

    While I am conducting a site visit to one of pressurized stair, I found out there is a concrete slab separated the mechanical equipment from the pressurized stair. The stair enclosure was supposed to be built in compl...
    last modified by hamad.koroni
  • 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
  • Pressure Sense Lines

    Dear Sirs, please permit to formulate two questions regarding to Pressure Sensor Line for jockey Pump and Main Fire Pump. Is it mandatory in the standard to install the two check valve DN 15 mm (1/2")  with the ...
    last modified by rodriguez@colasrail.com
  • 08/18/17: Energized Electrical Work Permit

    According to the 2015 edition of NFPA 70E, which of the following tasks would require an energized work permit in order to be performed in an energized state?
    last modified by dvigstol
  • 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
  • Define door release mechanisms.

    Can/will someone from the NFPA define/explain exactly what is ment by the term the releasing mechanisms of a door shall not required more than one motion. IE is the turning/twisting of a door knob on an egress door an...
    last modified by lsteffens57
  • Installing a FireRay 5000 Beam Detector

    Hi, this is my first time installing a beam detector, I have one FireRay 5000 Simplex (5000-103) to play around with. https://simplex-fire.com/en/us/DocumentsandMedia/4098-0042.PDF  I have some questions h...
    last modified by leliex
  • 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
  • 312.2 damp and wet locations

    312.2 says in wet or damp locations to cabinet or cutout boxes shall be mounted so there is at least 1/4 inch airspace between the inclosure and the wall or supporting surface. My question is how to achieve this spaci...
    last modified by charlesvanmeter

    Looking for CODE Reference for FIRE-STOP for SMU wall and cement Floor Penetrations , Annular spacing, rated and non-rated walls.
    last modified by anthony.arellano
  • What is the maximum length a hose can be for dispencing a class II (Diesel Fuel)?

    What is the max length the hose can be from the tank to the nozzle? The 120 gallon AST is only used to fuel support vehicle (forklift) at a marina.   Fire Inspector Baker Orleans Fire Department
    last modified by gbaker
  • Regarding NFPA 303 in Fire Extinguisher walk distance

    I have a new customer that wants to get his marina into compliance as to his fire extinguisher program.  This dock has sections that come off a main dock and encompasses around 4000 ft.  Generally its p...
    last modified by craig.hiser@yahoo.com
  • Private Hydrant

    This is probably a dumb question,  I have an existing Country Club that is fully sprinklered with a remote FDC, my water supply is approximately  2000 feet away,  they are building a new 2 story pool h...
    last modified by jgresch
  • Don't delay! February 28 deadline to apply for $500 Wildfire Community Preparedness Day project award!

    Could you use a little financial help for a  Wildfire Community Preparedness Day project?  Don't delay, apply today!  Get funding for a project or event on May 2 during NFPA's national campaign, thanks ...
    last modified by michelesteinberg
  • 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
  • Does attaching a snow plow to a 100LL aircraft refueler vehicle violate any fire regulation codes?

    I have this suspicion that attaching a snow plow to an aircraft refueler truck is not permitted, especially at a federally funded airport. It just sounds like a bad idea to put something that can create sparks on a ve...
    last modified by john3
  • how to protect an oil deposit?

    I must protect a structure where there are almost 20,000 liters of oil. This product is inside metal tanks (200 liters each) and plastic containers (5.000 litres each). I am using NFPA 11 2016 edition, but I cannot i...
    last modified by gustavocanizzo