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



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