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Joined: Oct 2005
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Thanks Hal. I appreciate your feedback. I reviewed the specs on few of the direct block protectors. This included a couple from Porta Systems. They indicated that the 26 gauge fuseable link is built into the BEP direct block. Does this offer the protection that is needed for a fuseable link? Won't the pairs "burn open" in this case?

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Won't the pairs "burn open" in this case?

Yup, that's exactly what they are supposed to do. When that happens that pair on the BEP block can no longer be used. If enough of them burn open and the loss of capacity becomes a problem you replace the BEP housing or block.

-Hal


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Quote
Originally posted by Lightninghorse:
Have to ask, Paul. Have building fires increased due to non-protected terminals, or would the 'powers that be' even admit to such a fact?
Sorry, looks like I missed that question before. shocked

To be honest, I've not seen any statistics one way or the other on this. A much larger proportion of telephone wiring is underground now compared to the past, although we still have a lot of overhead in rural areas.

Britain tends to have much less severe and much less frequent thunderstorms than many parts of the United States as well, so in today's cost-cutting climate lightning protection has taken rather more of a back seat.

Also, while contact with HV power is possible in some places, our cabling arrangements tend to keep telephone well away from it. You'll find phone running below 240/415 or 240/480V local distribution cables, but never on the same poles with high voltage. When phone has to cross HV at an angle, it almost always dives underground for that short distance then comes back to poles on the other side.

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That fusible link is what saves the building. Despite the fact that a maintained cross with power will effectively destroy the BET, it does it's job by having pairs that blow "open" to stop the direct metallic connection between the fault and the building.

Since the fusible link is either contained within the UL listed BET itself, or within the confines of a fire-retardant cable stub, what fails is a cable pair and any flame or spark is contained effectively.

Again, the fusible link is the proverbial (and intentional) weak link. It's understood that when it fails, the BET is shot. Lose a $1,000.00 BET, yet save a $1 million building, not to mention the potential personal injury or loss of life from a resulting fire. Remember, this cross with power can happen miles down the road, not just at the immediate premise.


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Good practice is to splice in some riser tails into a splice closure mounted inside the building, then take that to your protectors, or you can get the protectors with the tails already terminated and do the same thing. I think the point of protection has been a little skewed, its not about fire protection, it is about electrical protection for your switches, routers, modem equipment, and last and not least the end user's safety. I have never heard of a building catching fire because pic flashed and burned. I have however seen first hand what happened to a lady in Texas whose protector was not installed properly (Not grounded) by the telco installer, the scenario was she was chatting to a neighbor in a storm...the rest i leave to your imagination!


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I did see that 1a2 key caused a fire in a Macdonald's. This was years ago and I didn't install it.

But my best guess is that a fuse was strapped on a lamp lead.

A good one and true story is about the telco guy who grounded the protector to a steal fence.

The owner would chain the dog to the fence and every time the phone rang the dog would bark. Go figure this one out.

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