NCCER Electrical - Questions and Answers

NCCER Electrical - Questions and Answers An insulated type 600 volt crimp terminal for a 12-10 AWG is typically identified by which color code? Yellow What is the MINIMUM length pull box that can be placed in a 2 inch conduit run where the conductors will be pulled straight.. 16 Inches The NEC allows copper busbars to carry 1000 amps per square inch, if a bus bar measures ¼ inch X 2 inches how many amps is this bar allowed to carry 500 The outer covering on a liquid - tight flexible metal conduit is used for Moisture seal The wattage output of series resistance heating cables depends on the total circuit length and: Resistance Percent slip of an induction motor refers to the the ratio of synchronous speed to rotor speed to rotor speed of the motor A 10 inch offset at 30 degrees is being made what is the distance between center to center bends 20 inches What protects the wires from the sharp edges of the conduit is joined to the metal? Couplings .Compounds made of porcelain and plastic are used as____ Insulators The NEC requires conduit and fitting installed in hazardous locations to be wrench tight with MINIMUM of how many engaged threads? 4 What two purposes do measuring tape in conduit serve? it can spread a uniform film of pulling compound inside the conduit and provide an accurate measure IEC style contactor coils are marked with the labels of: A1 & A2 What is the source voltage in a circuit that consumes 1200 watts at a current of 5 amps? 240 volts If a 90 degree stub to be bent is using 10 degree segments, how many bends are required? 9 In hazardous locations where metal conduit is required, the conduit MUST be threaded with standard threads A current transformer has a rating of 4000: 5 if 1000 amps load is on the primary, the secondary output would produce 1.25 amps For a given number of poles, what determines the speed of an AC motor? Frequency Which type of conductor is approved for installation in a wet location? THHW The conducting connection, weather intentional or accidental between any of an electrical system is a: Short circuit Which type of transformer has its windings connected in series? A wye transformer When terminating the feeders to the main on switchgear, the feeders MUST be braced to withstand: arc flash energy The device used to prevent moisture from accumulating in hazardous wet locations is called a: A Drain seal When climbing a ladder ALWAYS face the ladder and: maintain three-point contact when climbing What type of bend is used to change conduit elevation to clear an obstruction and then return to the original eleva Saddle Which contact(s) are open when the switch is in the START mode? 1 & 2 The name for the tester used to verify phase sequence is known as: Phase rotation meter The term "ladder tray" refers to a tray that: Consist of two channels connected by rungs When using a power cable puller, the rope attached to the cable is wrapped around a drum called a Capstan Which type of raceway is NOT suitable to service where exposed to severe damage? Electrical metallic tubing When Verifying that a circuit has been de-energized ensure FIRST that: Its locked out and tagged out A conduit piston (mouse) is used for what application? Installing pull line