dpc, Sorry for not including a context. Area classification is greatly impacted by whether a space qualifies as a 'pit'. The application is multi-fuel engine testing in a cell (i.e. cut-off room) with an inertia mass and bedplate located in the center. Bringing services over to both the...
I'm searching for a code published or industry practice definition for the location term 'pit'. I know the NEC does not offer a definition so the request is for a building code or guidance type document that defines this term. I don't think "... an area often sunken or depressed below the...
In a classified (CID1) area a project proposes to have a ESD system composed of a continuous bare ground conductor belted interior to the room's perimeter (i.e over door opening, etc). This conductor is intended to be the point-of-connection for mobile gasoline containers and will be supported...
Thanx for your responses. IPCEA P-43-457 was last issued in 1961 and I'm looking for a more recent computational treatment of the subject. The application is research and development activities throughout a new building. Various voltage and frequency power systems (800 cycles per second is...
I'm seeking recommended published material concerning selection and use of standard building wire in the distribution of high frequency (~800 Hz) source voltage. The academic papers I've stumbled across so far have been thin on practical application guidance. Any forum help or insight is...
In an 850HP AC dynamometer application I'm seeing a single 3-phase combining reactor connected to the output of (2) inverters. For each phase... reactor line connection X1 is to one inverter and X2 to the remaining inverter. Reactor load connection is from X3 (center tap) to the AC motor...
