|Telephone Lightning Surge Arrestor Protector|
|Current Price : RM 5.00 (Standard Auction) Condition : New|
|Description||Biding Closed||Q & A (0)||Auction Info||Current Bidder (1)||Payment & Shipping|
|The item is offered by ROY FONG|
|Product Description for Telephone Lightning Surge Arrestor Protector|
Telephone Line Lightning Surge Arrestor
Why surge protection is needed ?
Telephone lines are long copper wires from central office to your house. Usually those wires are between few hundred meters to few kilometers. Those wires are connected in the central office to the telephone center/exchange. Normally there is only the 48V DC voltage from central office battery in the line, and when phone ring there is 70-130V AC voltage in the line. That's what in the line in normal operation.
But the situation in the thunderstorm is different. When the lightning hits the ground with it's millions of volts and thousands of amperes strike every wire in the ground or hanging in the air will notice it. Near lightning strike gan generate a surge pulse of thousands of volts to telephone lines. If this can go to the electronics inside the telephone or modem, the electronics will destroy at the same moment.
What types of voltage surges there are ?
There are two types of surges: differential and common mode. Differential surge is a voltage surge which is generated between the telephone wires. That is usually not great, because telephone wires are twisted pairs and is easy to stop by placing the Lightning Surge Arrestor between telephone line wires.
Other type of surge is common mode surge, in which the potential of the telephone wires raises thousands of volts from your ground potential. Usually the telephone wires are at potential quite near to the ground of your building. But if the lightning strike hits the central office (or some else place in telecom cabling near you), the potential of both of the telephone line wires can raise quite high (even thousands of volts). The common mode surges are usually bigger and more problematic than differential surges.
The Lightning Surge Arrestor only reduces the risk of your fax/modem/phone getting damage by lightning. If the type of surge is common mode surge, the arrestor might not be able to protect it. But if the Lightning Surge Arrestor comes with the Earth Wire and it is properly connected, the risk of getting lightning surge will be reduced further. If your phone line is strike by lightning, most of the time the lightning arrestor will be damaged but your phone equipment is protected, and you will have to replace with another new lightning arrestor.
The item on this bid is without the Earth Wire, if the model with Earth Wire is required, please add another RM5 on top of the price bid.
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We are the verified store member of lelong, we operate under a Sdn Bhd company with RM100,000.00 paid up capital. Company established in January 2002.
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