NEC 2017 680.26(B) states that conductive pool shells shall be bonded. 680.26(B)(1) states that, "Vinyl liners...shall be considered to be nonconductive materials." Some pool construction methods that utilize nonconductive vinyl liners also utilize a (unreinforced) concrete base (or shell) between native soil and the vinyl liner material. … Show more
moke system activation, signal to activte smoke system cab sent from smoke detector of water flow switch in sprinkler system i ask about case that recommended used onley water flow switch instead of detectors.
i would like to know the minimum diameter of pipping allowed for sprinkler system if it is made up of galvanized steel or iron ?
Hi Akhil: The minimum size pipe permitted for a steel sprinkler system is 1-inch pipe for a new NFPA 13 sprinkler systems according to 2016 NFPA 13: 126.96.36.199 under Plans and Calculations; Hydraulic Calculations Procedures; General Pipe sizes shall be no less than 1 inch nominal for black or galvanized steel piping No less than 3/4 inch…
Our design is dealing with sprinkler protection for rack storage of cartoned group A plastics. Due to a height of over 25 ft (7,6m) the arrangement drawn in Figure 188.8.131.52 (b) has been chosen for single and double row racks. What is the maximum vertical distance between in-rack sprinklers for this arrangement? My question is: Is it 10ft (3,0m)… Show more
I was recently at a residence where they had two separate and distinct switch boxes stacked on top of each other. The upper switch box was recently put in by another electrician and the lower switch box has been in use for a few years. Does this stacking of switches (One on top of the other spaced by approximately 1.5 inches) violate the NEC?… Show more
I am trying to determine whether or not there are any retention period requirements for the Infrared Inspections. I found under 11.17.5 of 70B the Infrared Information, but it does not mention best practice on how long to store records from the testing. Is there a time period to keep these records? Thanks again, Tyler
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Has anyone come across this in a fire investigation: LONDONDERRY — Officials say a refrigerator is the likely source of a two-alarm garage fire Tuesday evening in Londonderry. Crews arrived around 5:36 p.m. at 19 Chandler Drive to find a fully involved structure fire in a standalone garage, but the flames had not yet reached the main… Show more
Aren't most of the typical refrigerants used in consumer applications inert fluorinated and chlorinated compounds designed to be stable against polymerization? Perhaps the lubricant in the lines leaked out? This upcoming webinar might be helpful though. NFPA webinars - Evaluation of Fire Hazard of ASHRAE Class A3 Flammable Refrigerants
For one-off/custom built pieces of manufacturing equipment that can be simply unplugged before servicing, is it still necessary to have a lockable power switch? My local AHJ says that as long as the switch is within sight of where the servicing is being done then it's OK to not have a lockable switch. However much of the equipment gets shipped to… Show more
Have you listened to our five-part podcast series, "The Survivors"? It humanizes NFPA's statistics on home fires by underscoring the ordeal and aftermath of one family after they lost two children to home fire. Please reply to this blog and let us know if you've listened to all or any of the episodes. Were you moved by the family's story? Did… Show more
I was moved by the family's story. It broke my heart when the parents described how they were outside the burning home, but could hear the two boys still inside. I learned that although one might think you are prepared, with a fire there is no such thing. Having time to only grab a child closest to you and escape brings the message home about…
My understanding from the IBC is I only need 1 pull station, in a normally occupied area, in a school that is fully sprinkled. Yet there have been several AHJ's requiring pull stations at the exits of assembly areas like gyms.
With the school shootings happening, a school district has asked about removing pull stations. Is there any requirement for more than one pull station in a K-12 school?
Hi Larry: The AHJ may approve a equivalency to the NFPA 101 provisions. The initiation of fire alarm system for existing assembly occupations (gym should be assembly) Section 184.108.40.206 of the 2018 NFPA 101 requires two means to initiate the fire alarm system Manual means in accordance to 220.127.116.11(1) and; If automatic sprinklers are…
I am very aware that NFPA 25 inspections reference and are in relation to NFPA 72 standards. The question is: Is it require to verify the proper activation of notification appliances during a routine NFPA 25 inspection granted the building is equip with a full functional fire alarm system. If so, disabling such during the inspection can be… Show more
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A wonderful discussion with my friend michael.civitello inspired this conversation. Michael pointed out that moderate sedation is permitted in both NFPA 99 2015 and 2018 Category 2 and 3 medical gas systems. Meanwhile, in the new Chapter 15 Dental Gas and Vacuum Systems of NFPA 99 2018, Category 3 systems allow only minimal sedation and… Show more
Hi to all: From an experienced regulator of health care facilities, here are my two cents. As all code languages are concerned, there may be specific definitions for terms used in the code. Section 3.3.38 of 2018 NFPA 99 defines a dental office " A building or part thereof in which the following occur: (1) examinations and minor…