HOW TO PROTECT SIGNAL LINES?

In order to protect asignal lineordata, be it a TV antenna, telephone line , internet, CCTV, Profibus, or CANbus, is it is advisable to install an SPD placed in series with the line itself.

Its sizing occurs according to:

• ·    of thenominal voltage U_nof the line,
•      of the load absorption (rated absorption current I_L),
• of theworking frequencyof the signal.

In accordance withCEI 62305 ed. 2, this type of protection is mandatory as it is It is necessary to intercept all lines entering and exiting the business. in existence.

The insertion of a signal or data SPDdoes not lead to the reduction of communicationsince, if correctly sized, the limiter overvoltage has a higher bandwidth than the same signal.

The range of  S-ASI arresters in the R, L, B and G families have a withdrawable design;when a signal interruption occurs, the a sign of the fact that the arrester has protected the system from an overvoltage and is has reached its end of life(short-circuited to ground). To restore the signal quickly, it is necessary to simply extract the cartridge keeping in mind that there is no more no protection on the line. If this is the case, it is recommended to replace the entire arrester as in the presence of atmospheric overvoltages the base could also be damaged, leading to reduced system performance.

Last precaution not to be overlooked during installation is respect the IN/OUT interconnections present on the SPD(IN field side, OUT side of the equipment to be protected).

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