Log in to follow, share, and participate in this community. I am installing temperature monitoring and alarm devices in a Class 1 Division 2 area I'd like to get confirmation of my understanding from other professionals regarding the installation. The alarm co... Is as access floor required to be grounded? In an office building, carpeted tiles. Power under floor in raceway. Non-stringered flooring spec'd (tiles screwed down at each corner) and ground straps a... NFPA 70 517.31(B) (2014) says "one transfer switch and one downstream distribution system shall be permitted to serve one or more branches in a facility with a maximum demand on the essential electrical system of 150 ... What type of breakers are available today that will allow "Double Tapping" in a residential breaker panel? The NEC don't allow for the use of nonmetalic electric conduits in plenum (open space above false ceiling used for return air) in order avoid the convey of smoke and/or fire to other parts of the building. Is this ap... Good Afternoon, When removing covers from electrical panels but leaving the deadfront in place are employees required to wear Arc Flash protection and follow approach boundaries? This is commonly done fo... I thought that I would open up a discussion where viewers of this thread could share what they perceive to be the greatest electrical safety concern that they encounter or perhaps the most frustrating electrical safet... 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... × Enhance Your Protection Trend Micro Maximum Security has updated the Trend Micro Security icon on your browser. Learn more I'm trying to locate the Code reference that states "Cables cannot use components of another trade as direct support." We have a Maintenance person that keeps using the Fire Suppression pipes and Heat Ducts to suppor... Is there a minimum lighting level required? The energy guys in CA have decreed that for 2020 electric room lighting is reduced to 0.4 watts/sqft with 0.2watts/sqft for specific task area lighting allo... I work for an HVAC service and installation company providing service on residential, light commercial and industrial equipment. We have acknowledged that our current uniforms are lacking in the correct level o... Hallo everyone! Can anyone tell me if low voltage electrical safety is regulated on the US-federal level and if so, where (CFR, etc.)? I would really appreciate your support! Greetings, Are there any NFPA mandated requirements that require HWH for emergency eyewash to be powered from stand-by system bus as opposed to "normal" system bus? I have a system that has a normal bus supplie... Good Day, In the process of setting appropriate safe work conditions for use on various pieces of electrical equipment, the team at my organization has uncovered some questions on appropriately applying the 50... Conductors in a cable tray are installed per 392.80(A)(2)(d) and both ends of the conductors emerge from the cable tray and terminate in equipment with 75C rating. Since the conductors are installed per 392.80(A)... In the 2017 NEC, MUST this receptacle have GFCI protection? From what I'm reading I cannot determine if they mean ONLY the garage receptacles in "storage areas, work areas, and areas of similar use." I thought that as I close out this work week I would say thank you to all that contribute to making the use of electrical energy safer, more efficient, and easily accessible. Have a blessed holiday ! When did the rule forbidding garage outlets on Small Appliance Branch Circuits begin? I know that it's 210.52(b) in 2014, 220-3(b) in 1974, 1962, and 1959, and 2115-b in 1956. As per NFPA 72, what is the minimum required area of the room or building where fire alarm control system is not required?