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NCCER ELECTRICAL LEVEL 3 MODULE 6
'DISTRIBUTION EQUIPMENT' 2026|
QUESTIONS AND VERIFIED DETAILED
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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) ___.
AC time overcurrent relay Name the four general classifications of circuit breakers. Air, Oil, Vacuum, and Gas circuit breakers What are the two basic function performed by switchgear? Provides a means of switching or disconnecting power system apparatus; provides power system protection by automatically isolating faulty components When wiring switchboard electrical components, keep the control wires at least ____ from moving parts. 1/2" (13mm) Specific instructions for handling, storage, installation, testing, and maintenance of distribution equipment are found in the ____. manufactures instructions What is the function of an MVL switch? 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?
Saturation level The basic purpose of a switchgear is To provide power system protection by automatically isolating faults Circuit breakers are given on The nameplate
