My question has to do with ampacity of feeder conductors in parallel. Parallel feeds must follow 310.10(H), last time I checked. 310.10(H) states that it's only allowed if one follows 310.10(H)(2) through 310.10(H)(6) 310.10(H)(4) requires an ampacity adjustment per 310.15(B)(3)(a) ASSUME NEUTRAL IS A CONDUCTOR 310.15(B)(3)(a) states that for… Show more
According to ventilation of a typical engine room it is suggested that temperature of the room should not exceed 49°C. Could anyone help me regarding NFPA suggestion about firepump room ventilation. Typically in bangladesh we suggest both electrical and diesel pump along with jockey pump. It would be helpfull if anyone can suggest also the… Show more
Dear nfpa staff i have big storage tank with fixed roof for edible vegetable cooking oil , above ground tanks.20 numbers with the same diked area. as the oil is defined a liquid class 3B. does require a fire fighting system and if yes which system regards ghassan traboulsi@
I was wondering if you are able to store items on top of the safety cabinet containing flammable chemicals. Is there any restrictions on what you can and cannot store according to OSHA and NFPA? Or are we able to store certain items while others cannot be stored?
Do not remove the inner or outer cabinet vent plugs without Environmental Health and Safety (EHS) approval. Do not ventilate or connect the storage cabinet to a vent duct without EHS approval. Never cut, modify, or tamper with the construction of the cabinet. All cabinets must be UL listed or FM approved. Cabinet doors must be fully closed and…
Can I install, in the field, a cylindrical lockset in a fire rated door? I have read the NFPA 80 regarding this but I am unsure if I can drill a 2 1/8 inch hole for the installation of the lockset.
A 45KVA transformer located in the basement, 460 volt 3 phase primary out to a 120/208 volt 3 phase circuit breaker panel on the second floor of a 2 story building. The primary protection is a 460 volt 3 pole breaker of the correct size in the same room as the transformer. The load center is location on the 2nd floor. The transformer is not wired… Show more
Hoping to get some input on electrical outlet placement on what was a raised bar peninsula that has been modified to a single level island. Pictures below are a snapshot of the electrical blueprint when the house was built back in 2000 and a cleaned up version to better see the information (ceiling puck lighting sort of mucking things up,… Show more
What I see there in that blueprint is wall space and it has a backsplash. It is built with 2 x 4 construction (knee wall). It falls under 210.52(C)(1). The commentary in the handbook on page 84 uses the term "qualifying island and peninsula countertop spaces." This is not a qualifying island due to the construction of the knee wall.
Hello, I am trying to reach Ken Willette. Thank you. Chris Barton, editor, Fire Engineering Books
Do NFPA have a standard on how to conduct risk assessments? If so please provide Standard number. If not a RA Standard is recommended for good use by management and safety professionals.
Hello, we imported Electron-Beam Welding machine from EU to US. We invited UL inspector for the Field Inspection and received a lot of comments. While we working on UL's coments, our city's electric engineer refuses to approve the electric permit that we have open for connecting equipment to the electrical grid. Does City has authority to demand… Show more
Any NRTL mark should be fine for the AHJ (not necessary UL) . The AHJ usually inspect the final installation . In case of the system and critical components are not evaluated (listed) for the proper end product US standard, the AHJ would not be confident to allow the end product to operate. In this case you need to contact NRTL to do fielded…
May I request to know the requirement of SCH40 pipe pressure test in Clean Agent such as FM-200 and Novec 1230 system?
Hello Sir/ Madam, This is Mr. Wai Yan from Rhino Shield Co., Ltd. May I request to know the requirement of SCH40 pipe pressure test in Clean Agent such as FM-200 and Novec 1230 system? What is the pressure rating to test the pipe as per NFPA 2001 standard? How many hours need to wait for certify and approval as per NFPA 2001 standard? … Show more
From the very beginning of my exposure to the NFPA 70E I have been taught that if I am inside the limited approach boundary with exposed energized conductors i have to wear appropriate ARC rated PPE. My management is telling me that only inside the ARC flash boundary am I required to wear PPE. I have been looking through ht e 70E and all I keep… Show more
James, It is important to understand that the arc flash protection boundary is entirely separate from the limited and restricted shock protection boundaries. You must wear the appropriate PPE where a hazard of injury exists. (or potential hazard) Arc hazards and shock hazards are not the same and the methods of selecting personal protective…
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#I would like to request your clarification for below standard as we have doubt to compare the pump test result which we recently done. 22.214.171.124.3 (2) Fire pump test results are no less than 95 percent of the flow rates and pressures at each point for either a or b – at each point means? Does it require to compare all 0% flow and pressure , 100%… Show more