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+--- Thread: Telephone Protection Board fuse rating (/thread-385.html)
- lms - 12-20-2006
Does anyone know what the fuse rating should be on the telephone protection board? A nearby lightning strike has resulted in blown fuses with charred semi-melted and charred casings and the rating cannot be read - and of course I never made a note of the ratings before the event!
Probably the worst storm in a few years and Comfort survived! I have 3 SEMs, one in another building via a 35m underground STP cable, and one external door station (at the gate) (also STP - about 40m). Almost everything is protected (other than KA/KB for which I haven\'t been able to source a protection device that passes the signal), but when a loud crack and a ping were followed about 30 seconds later by continuous beeping from the keypads, I thought that Comfort was probably fried! There was also no response to keypresses. But after the storm a system reset appeared to resolve everything - except that Comfort\'s date/time had been lost, and the fuses on the TPB01 had been blown.
Most of my neighbours\' have had some damage to various devices, while I\'ve got a pair of blown fuses! Am I lucky or do I simply have a good product!? (I suppose I do have more protoction than most.)
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Leon
- slychiu - 12-20-2006
Glad to hear Comfort survived.
The fuse is a special lighting rated fuse at 0.375 A. You can put in a regular fuse for the time being especially if you dont mind changing them every now and then.
There are also other varistors on board which hekp in the protection. Make sure they are not shorted, which may happen if the surge is direct
- lms - 12-20-2006
Hi Chiu:
Thanks for your reply.
Could you elaborate just a little!
I have phoned many local component suppliers and everyone asks \"what\'s a special lighting rated fuse?\". Also, no-one has ever seen a 13x5mm fuse! My only option may be to solder in a \"pico\" fuse or an inline fuse holder. But even then, the closest match I can get is 500mA. Is this likely to be too high for effective protection? (Probably still better than nothing - I\'ve currently had to bypass the board and am keeping a careful eye on the weather!)
The varistors appear to be OK. Actually, by the state of the fuses, I\'m surprised that there\'s not a single mark on the board!
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Leon
- slychiu - 12-21-2006
Sorry I meant a \"Lightning\" rated fuse. This is not common. In the meantime you can use a 500 ma fuse. We will send some spares to Komfort inside the next shipment