Log in to follow, share, and participate in this community. 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... i am going to active the deluge system with it and its inside Say for example, you have a 120/240 V, 2 pole, 20 A breaker. Does the NEC allow this breaker to serve 2 separate 120 V circuits? I have had a question for some time about operating molded case circuit breakers with or without PPE. NFPA 70E states in table 130.5 that under normal conditions it is a low risk of exposure to an arc flash.... Been having some discussions with other people in the trade, and the subject of Service Disconnects came up in regards to OCP and it's location for dwellings or in general. Some have mentioned that the first OCP devic... For those who were helpful on this post, Thank You. Chiefns830 managed to drive me away. Nothing that I read indicated that homeowners were not welcome to ask electrical questions. I have a system where we are supplying a skid with 3 VFD/motors. The VFD/motors are each wired to there own fused safety disconnect. The skid also has a fused disconnect for power supply to a 480/120 transformer... Using ICC 2012 and NFPA 72 2010 edition, Given an occupancy that is not required to have a fire alarm by 907.2.4 and is sprinklered per 903.2.4 thus contains a dedicated function fire alarm unit for water flow ... Does Fire Sprinkler riser's water flow switch initiate elevator emergency recall? In NFPA 72 "Table A.188.8.131.52" Typical Input/Output Matrix" shows water flow switch on first or second floor initiate elevator emer... Hi, Any one tell me the NFPA allowed sprinkler system in celling. 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 t... I know NEC 250.122 takes you straight to a table that has had equipment grounds sized as long as I've been an engineer, but I recently came across a situation where I wanted to plot a conductor damage curve and a circ... As it pertains to NFPA 70E's requirement of placing a device, piece of equipment etc in a "Electrically Safe State", you turn off a breaker to a light switch or outlet. The next step is to verify via a meter that the ... please advise me which detector are good for engine hall heat detector or flame detector acording to NFPA-72 Please help me to design fire alarm system according to NFPA-72.I have NFPA copie. NFPA79 specifies: 184.108.40.206 The use of other colors for the following applications shall be as follows: (1) WHITE with BLUE stripe for grounded (current-carrying) dc circuit conductor (2) WHITE with ORANGE stripe ... Referring to NFPA 70E Table 130.7(C)(15)(A)(b) - Where is there more info, step-by-step, on how to go through the process in this table? I can't find any links and there's nothing in the annexes for this. I would hope... Imagine being asked to have a look at a piece of equipment that is having some issues or perhaps you might just be doing periodic maintenance and inspections. The equipment could be any number of types but I’ll ... There has been some debate among my coworkers lately about the "Hand" switch leg of a rotary HOA selector switch going directly to the coil of a motor starter. I have been making the case that this i... I have a 100 amp breaker feeding a 60 amp sub panel on a rooftop. Would that sub panel need a main breaker or a disconnect?