The requirements of UL 1008M and the requirements of UL 414 that are referenced in UL 1008M must both be met for a listed meter mounted transfer switch.
Note, many utilities do not permit these to be used. My local utility does not and one of their objections is the neutral jumper that must...
While a lot of equipment installed in the US is required to be listed, there is no requirement that it be listed by UL (Underwriters Lab. There are multiple listing agencies that can list equipment for use in the US. One list of such agencies can be found at OSHA, as they maintain a list of...
What type of machines do you build panels for? In what type of occupancies are they typically installed in? You are doing your customers a huge disservice if your panels are typically install in occupancies that would be expect to have an available fault current exceeding 5 kA. The cost to...
I would install a conduit tee fitting with a drain on the bottom, and bring the liquidtight flexible metal conduit of out the side fitting of the tee. However that won't fix issues with any connections in box that is in the ceiling. There are wire connectors listed for wet locations that could...
The NEC, NFPA 70, requires the equipment installed in a Zone 22 location to be listed and marked as suitable for the location. This is a bit more restrictive than the NEC requires for a Class II, Division 2 location.
506.20(C) Zone 22. In Zone 22 locations, only equipment listed and marked...
Is this a multiconductor cable, or single conductors? In general, the minimum permitted bend radius for the conduit bends is suitable for the installation of single conductors.
Not sure anything in the NEC would require that equipment to be readily accessible. That equipment is accessible, but it is not readily accessible.
Accessible, Readily (Readily Accessible). Capable of being reached quickly for operation, renewal, or inspections without requiring those to...
The only time the NEC requires testing of a grounding electrode is the case where you want to use a single rod, pipe, plate electrode.
The main rule says electrodes of those types must be supplemented by another electrode of one of the types in 250.52(A)(2) through (A)(8)
250.53(A)(2)...
"Fiberglass" conduit is covered in Article 355 of the National Electrical Code, Article 355 Reinforced Thermosetting Resin Conduit (RTRC). There are no specific requirements as to the types of support that can be used with RTRC.
The small pops are common with hot burning wood fires, and it could also be spalling concrete. Some of the louder ones were probably truck tires, and the big ones, likely propane tanks from the fork lifts.
Listening to the fire radio, there were active commercial pallet yards involved in this fire. They were also having to tag hydrants outside the immediate area to supply enough water....multiple hose lines at 250 GPM, and master streams at 750 to 1500 GPM. Fire extended to buildings in the ares.
