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NCCER ELECTRICAL LEVEL 3 MODULE 6 DISTRIBUTION
EQUIPMENT EXAM | QUESTIONS AND CORRECT ANSWERS |
EXAM GRADED A+ | LATEST EXAM
Which of the following is true with regard to switchboards Switchboards are used to subdivide large blocks of power When installing wiring within switchgear, use self adhesive cable ties every ___. 12" (300mm) The maximum voltage that a piece of equipment can withstand is known as its ____. Basic impulse insulation level (BIL) Bolted pressure switches are often used in place of ___. Circuit breakers A transformer's temperature rise rating refers to ___. The maximum elevation above ambient temperature that the transformer can withstand without insulation damage A service has a three-phase supply with 14 single-pole circuits and 4 three- pole circuits. The minimum number of poles required is ___. 30 Per NEC Section 408.3(E)(1), AC phasing in switchboards must be labeled ___. A,B,C from front to back, top to bottom, or left to right when read facing the front of the switchboard On a typical electrical diagram, the standard abbreviation for a phase meter is __. PH The typical insulation resistance of equipment rated at 480V is ___. 100 megohms
A typical overpotential test voltage for a used piece of equipment with a nominal voltage class of 600V is ___. 2,000 VDC A ground fault relay should be mounted in an enclosure ___. In a vertical position with the terminal block at the lower end In Industrial applications, medium voltage may refer to systems rated over ___. 1,000V up to 35,000V The term Interrupting rating refers to the ___. maximum current a device will safely interrupt at rated voltage Which of the following is NOT a general classification of circuit breakers? Fuse circuit breaker A 4,000A switchboard requires a minimum distance from the phase bus to the closest steel member of ____. 6" (150mm) When an unintended path is established between an ungrounded conductor and ground, it is called a(n)____. ground fault A transformer rated at more than 500kVA is considered a(n) ___. power transformer The term capacity on a transformer nameplate refers to ____. its ability to transfer energy The term class on a transformer nameplate refers to ___. the type of cooling it uses The secondary of a current transformer is usually designed for a rated current of ___. 5A Of the following types of current transformers, which is normally used within circuit breakers?
Its designed to conform to ANIS standards for metal-enclosed switchgear Common causes of ground faults include ___, ___, ___, ___, ___, and ___. deteriorated insulation, moisture, dirt, rodents, foreign objects(tools), and careless operation The standard output voltage of a potential transformer is ___ or ___ , depending on whether the primary connections are from phase-to-phase or phase-to-neutral. 120V or 69.3V The type of conductor that may be any color except green, green with a yellow stripe, white, or gray is a(n) ___. ungrounded conductor (Hot) Define the term interrupting rating. The maximum current a device is intended to interrupt under standard test conditions. Switchboard control and meter wiring standards shall meet the requirements of ____. NEC Section 110. What are the standard abbreviations for a time-delay open, pressure switch, auxiliary switch, and backlighted pushbutton? TDO, PS, XS, BLPB What is the purpose of a single-line (one-line) diagram? A single-line diagram is defined as a diagram that uses single lines and standard symbols to indicate the paths interconnections, and component parts of an electrical circuit or system of circuits. The three generic types of ground fault systems include ___, ___, and ___. ground return, residual ground, and zero sequence Wires from the sensor to the ground fault relay should be no longer than ___, and no smaller than ____ AWG. 25'(7.6m); No. The instantaneous trip feature of a standard ground fault relay has a fixed time delay of approximately ____ cycles.
What is the abbreviation for an oscilloscope? CRO What is the abbreviation for a coil on electrical drawings? CC Which of the following tests is conducted in order to detect loose connections? Heat scanning test A downed power line is most likely to result in a ___. Phase Failure A connection diagram should be used to ___. Show the internal wiring connections between the parts that make an apparatus When the CT is on an energized buss and not connected will ___. Burn up What type of diagram shows the actual wiring connection between u it assembles or equipment with each wire labeled to indicate where to terminate it? Point to Point The 3 sections of switchgear are ____. front/bus/the cable or termination How do you check ohms of switchgear? 1000v megger Non standard abbreviations used on drawings are typically defund in the what Legend The continuous current that a circuit breaker can carry without exceeding a standard temp rise is known as the Rated current
