101 Basic Series - Module 03 - Post Assessment
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1
This electrical distribution system is used for commercial buildings and shopping centers where it is necessary to minimize interruptions.
2
Electric codes usually carry ______________ compliance, such as those from the NEC.
3
Single-phase, three-wire has two hot wires and one neutral wire and can supply both 120V and 240V.
4
The illustration above shows which power system?
5
________ are the result of placing excessive loads on the circuit beyond the level the circuit was designed to handle safely.
6
If the branch circuits supply motor loads, fully rated or selectively coordinated systems should not be used.
7
IEC stands for ________?
8
Which overcurrent condition usually has the smallest magnitude of current?
9
A one-line diagram can show a simple DC circuit, but it cannot show a complex 3-phase system.
10
An electrical distribution system that has one power source for a group of customers is a ________ distribution system. A circuit failure in the system causes a power interruption for all in the system.
11
The ________ distribution system is the most expensive, but provides the most reliable service in terms of continuity.
12
A piece of equipment meeting one set of standards automatically meets other standards since they are all so similar.
13
In a three-phase system, each phase is ________ degrees apart.
14
Utility companies can use smaller cables for distribution because when voltage is increased, current is ___________.
15
The type of system coordination in which all circuit breakers are rated to operate independently is ________.
16
The selectively coordinated system is the most costly of the three basic systems of coordination.
17
The maximum short circuit current that an overcurrent protective device can safely interrupt is known as its interrupting rating.
18
A graphical representation of an electrical distribution system is called a ________.
19
If equipment meets certain safety standards set forth by Underwriter's Laboratory, the equipment becomes _____________.
20
The ________ steps down the voltage to useful voltages to be delivered to homes and facilities that it supplies.