 |
In order to provide effective protection, a transient overvoltage
protector must: |
 |
be
compatible with the system it is protecting |
|
survive
repeated transients |
|
have
a low 'let-through' voltage, for all combinations of conductors |
|
not
leave the user unprotected, at the end of its life, and |
|
be
properly installed |
|
Compatibility
The protector must not interfere with the system's normal operation: |
|
mains
power supply protectors should not disrupt the normal
power supply or cause high leakage currents to earth, |
|
protectors
for data communication, signal and telephone lines should
not impair or restrict the systems data or signal transmission. |
|
Figure 1 summarises potential sources of system impairment. |
|
| |
| 1
| 2 | 3
| 4 | 5 |
| |
