2. Assume you are an electrical apprentice. The electrical foreman on the job tells youto connect some equipment grounding conductors to the ground bus that runs alongthe front bottom of a dead-front switchboard. The system is 480Y/277-volt solidlygrounded wye. The building is still under construction, and a number of other tradesare working in the building. The switchboard has already been energized, and it istotally enclosed except for two access covers near the front bottom where the groundbus runs. The ground bus already has the proper number of and size of lugs for theequipment grounding conductors. You ask permission to turn off the main power sothat you can work on connecting the equipment grounding conductors to the groundbus without having to worry about accidentally touching the phase buses with yourhands or with a screwdriver or wrench. The foreman says, “No.” What would you do?

What happens in a multi-wire branch circuit when the grounded (neutral) opens or becomes disconnected? Select one: a. an arc fault occurs b. current rises c. voltage rises d. nothing happens

You just moved into a new house and notice that the bathroom light and hall light will not turn on unless the switch for both lights is in the on position. What can you conclude about the lights? a. The hall light and bathroom light are wired in parallel. b. The light switch for the bathroom resets a breaker for both lights C. The hall light and bathroom light are wired in series. d. The hall light and bathroom light must have two separate power sources. e. Two of the above.

12. A short circuit describes the condition where there's contact between theA. hot wire and the neutral wire.B. grounded conductor and the grounding wire.C. hot wire and the grounding wire.D. neutral wire and the grounded conductor. I'm not sure if it's the letter A or C, could you help me with the correct answer.

You are an electrician working in an industrial plant. The company is constructing a maintenance shop located 225 feet from the main plant electrical system. You are to install a 400-ampere three-phase wire system in the new maintenance shop. The service is supplied by the existing plant service. The voltage is 480 volts and the voltage drop is to be kept at 3% or below at full load. The conductors are to be aluminum. What size conductors should be installed for the new service? Express your answer to the nearest standard wire size. (Note: Determine the wire size by calculating length, resistance, and voltage drop as opposed to using the National Electrical Code.)

1. Electric utility installations and equipment under the exclusive control of the utility donot have to conform to the National Electrical Code. However, they do have to conform to the . 2. Assume you are an electrical apprentice. The electrical foreman on the job tells youto connect some equipment grounding conductors to the ground bus that runs alongthe front bottom of a dead-front switchboard. The system is 480Y/277-volt solidlygrounded wye. The building is still under construction, and a number of other tradesare working in the building. The switchboard has already been energized, and it istotally enclosed except for two access covers near the front bottom where the groundbus runs. The ground bus already has the proper number of and size of lugs for theequipment grounding conductors. You ask permission to turn off the main power sothat you can work on connecting the equipment grounding conductors to the groundbus without having to worry about accidentally touching the phase buses…

If the cable in Figure ran for the whole of its length, grouped with others of the same size in a high ambient temperature, and was totally surrounded with thermal insulation, The correction factors considered will be----------- Fuseboard High ambient temperature Cable Grouping of cables Thermal insulation Load BS 3036 fuse O a. Cg O b. All Ca,Cg.Ci and Cf O c. Ci O d. Ca

QUESTION 3 We are running 3 wires and a ground in a RMC to a control panel with a 60 amp circuit breaker disconnect in the control panel. The conduit is run along the ceiling where the ambient air temperature is 100 degrees. The control panel feeds our secondary cooling pump. What size are the ungrounded conductors? All conductors have typeTHHN insulation.

Electrical plants Define the terms "Main column ." " Line ." " Protection earth " and " Operating earth

We are running 3 wires in an IMC to a control panel with a 150 amp circuit breaker disconnect in the control panel. The conduit is run 12 inches above the roof on a strut rack. The ambient air temperature is 88 degrees. This control panel feeds the #1 cooling fan. What sized ungrounded conductors do we need? All conductors have typeTHHN insulation. A #1 AWG    B 100 Kcmil    C #1/0 AWG    D #10 AWG What sized IMC do we need? A 3/4"    B 1 1/4"    C 1"    D 1 1/2"