101 Basic Series - Module 28 - CEU Education
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1
If the maximum surge is 10 kA, why do many suppliers suggest installing a device that can handle up to 250 kA per phase?
2
Noise can be brought about by the differences in ground potentials throughout an electrical system.
3
Lower let-through voltage offers lesser surge protection for downstream loads.
4
When exposed to IEEE-defined test waveforms and UL 1449 2nd edition test results, the SAD and MOV devices have the same Suppression Voltage ratings.
5
Sags can affect operating coils of motor starters, which are designed to drop off-line at less than ________ voltage.
6
Swells are often caused when there is a sudden load decrease.
7
Transients and surges are different kinds of disturbances.
8
The design goal of a surge protection device is to divert as much of a transient power disturbance away from the load as possible.
9
The integrated design of SPDs has solved many problems associated with the standalone approach providing improved suppression performance.
10
Lower impedance translates directly into higher let-through voltage.
11
In an industrial application, the first stage of protection is provided at the service entrance, with an SPD integrated into the switchboard or main panelboard.
12
A surge is a single, non-repeating voltage distortion of less than 0.5 cycles in duration.
13
With proper implementation of surge protection devices and shielding equipment, the vast majority of lightning losses are preventable.
14
In AC power applications, over 99% of SPDs incorporate SAD technology because of the high-energy capability and reliable performance as a clamping device.
15
________ is usually accomplished by attaching a conductor to a metal electrode (rod), which is then buried in the ground.
16
Selenium cells are metallic rectifiers (diodes) with a maximum reverse voltage of only 25 VDC; so that many cells are required for higher voltages.
17
The ANSI 62.41 standard classifies feeders and short branch circuits as:
18
The ANSI 62.41 standard classifies outside and service entrance circuits as:
19
Let-through voltage is the amount of voltage that is not suppressed by the SPD and passes through to the load.
20
When selenium cells are used in parallel with MOVs, there is a large advantage gained in performance, cost or application flexibility.
 
   



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