Assume a bank of heating strips is rated at 20 K W and is connected to 240 volts. The heat strips operate for 4 hours at a time and are located in an area with an ambient temperature of 96 degrees F. The termination temperature rating of the heat disconnect lugs is unknown. Three (3) Copper conductors installed in a conduit with type THWN-2 insulation are to be used to connect the heaters. What size conductors should be used?

To testing installation of grounds, the usual procedure is to connect one lead of the megohmmeter to one of the conductors, then the other lead is___. A, connected to another conductor b, connected to the conduit or raceway c. Connected to a special grounding electrode on the megohmmeter d. Left unconnected

Eighty 16 AWG copper conductors with type THWN-2 insulation are to be run in a conduit. The conduit used in an area that has an ambient temperature of 120 F. What is the maximum ampacity of these conductors?

Three 10 AWG, type THW conductors are to be installed between poles on individual insulators. What will the conductor ampacity be?

1. A14/2 type copper used for a general lighting branch circuit.                                                Ampacity:______________              Maximum Fuse or Circuit Breakers Sizes:________________      2.Three 8 AWG copper conductors with THHN insulation Installed in garage in electrical metallic tubing (EMT). The ambient temperature in the garage can reach as high as 110'F. All termination points for this circuit are rated 60'C.                            Ampacity:______________                  Maximum Fuse or Circuit Breakers Sizes:________________ 3.Four 4 AWG copper conductor with THWN insulation imstalled in EMT in a basement. All termination points are rated at 60'C.                                 Ampacity:______________                  Maximum Fuse or Circuit Breakers Sizes:________________  4. An 8/3 Type UF copper cable installed underground from a house to a detached garage to feed a 120/240-volt subpanel. All termination points are rated at 60'C.…

A? Conductor is defined in NEC 240.2 as a conductor, other than a service conductor, having overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are not taps. A. Faulted b. Tap c. Magnetic d. Copper-like

How is the grounded dc conductor of a photovoltaic system required to be identified? a. shall be identified at the time of installation by distintive red markings on some of the terminations b. shall be identified at the time of installation by distintive blue marking at all terminations c. shall be identified at the time of installation by a distintive grouping of wires AWG #2 d. shall be identified at the time of installation by distinctive white marking at all terminations.

A 1000-VA, 230/115-V transformer has been tested to determine its equivalent cir- cuit. The results of the tests are shown below. Open-circuit test (on secondary side) Short-circuit test (on primary side) Voc = 115 V Vsc = 17.1 V %3D %3D Isc 8.7 A Psc loc =0.11 A Poc = 3.9 W = 38.1 W (a) Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer. (b) Find the transformer's voltage regulation at rated conditions and (1) 0.8 PF lag- ging, (2) 1.0 PF, (3) 0.8 PF leading. (c) Determine the transformer's efficiency at rated conditions and 0.8 PF lagging.