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Telephone demarc boxes #5142175 06/23/19 07:10 PM
Joined: Mar 2004
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Donald Offline OP
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Is there a way to tell if the surge protector in the box is still functioning as a surge protector?

Maybe we have an old phoneman as a BITOG member?


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Telephone demarc boxes [Re: Donald] #5142213 06/23/19 07:52 PM
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chemman Offline
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I had to have the surge protector replaced twice in the last five years. I knew something was wrong when I picked up the phone and all I heard was a constant staticy noise and could not dial any numbers. Took the repair tech about 5 minutes start to finish to diagnose and fix the problem.


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Re: Telephone demarc boxes [Re: chemman] #5142268 06/23/19 08:34 PM
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Donald Offline OP
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Originally Posted by chemman
I had to have the surge protector replaced twice in the last five years. I knew something was wrong when I picked up the phone and all I heard was a constant staticy noise and could not dial any numbers. Took the repair tech about 5 minutes start to finish to diagnose and fix the problem.


Yes, I am sure a phoneman knows how to test a surge protector, but how can I test it?


2015 Subaru Forester 2.5 engine/CVT
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Re: Telephone demarc boxes [Re: Donald] #5142315 06/23/19 09:29 PM
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NO2 Online Content
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Amazing that these are still in active use.

Re: Telephone demarc boxes [Re: Donald] #5142345 06/23/19 10:10 PM
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chemman Offline
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I think that if your line is noisy, then the surge protector is bad. If it's quiet then the surge protector is likely bad. That would be my guess based on the two instances I experienced.


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99 Silverado 5.3L Hav 5w30 PL/L25288
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Re: Telephone demarc boxes [Re: Donald] #5142378 06/23/19 11:20 PM
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tank Offline
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The protector is in place to protect the inside wiring and customer premise equipment from power surges/lightning strikes. They are gas filled and I’ve seen them pop in hot weather. Just bypass it. Drop wire to IW. See if dial tone returns. Best way is to clip to the disconnected drop with a buttset. I was a telephone repairman for seventeen years and have changed quite a few of them.


2019 Toyota Tacoma TRD Sport
Re: Telephone demarc boxes [Re: chemman] #5142381 06/23/19 11:32 PM
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Dave9 Offline
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Originally Posted by chemman
I think that if your line is noisy, then the surge protector is bad. If it's quiet then the surge protector is likely bad. That would be my guess based on the two instances I experienced.

lol WHUT? Either way it's bad?

Okay I get what you meant, but let's back up a minute...

How to test whether a surge protector still works depends on how it's designed. Each discrete component has its own test method.

Unless you're a rocket surgeon (aka electronics guru) who has a bench supply capable of generating high voltage, and reverse engineer the surge protector to determine what the clamp voltage should be, then instead you inspect the components.

Again it depends on how it is designed, but to start with, if you see spark gaps with burnt bridges, or MOVs cracked apart or pinholes in them, they are out of service. Similarly any blackened component is suspect. I am over-generalizing now, some things like TVS or GDT, are probably fine if they look okay. Shunting a large surge then failing to provide further protection, tends to be destructive visually.

Re: Telephone demarc boxes [Re: Dave9] #5142418 06/24/19 01:34 AM
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javacontour Offline
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Noisy as in popcorn or similar on the line. Quiet as in no dial tone at all.


network down, IP packets delivered via UPS -BOFH
Re: Telephone demarc boxes [Re: Donald] #5142502 06/24/19 06:38 AM
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mk378 Offline
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If one fails open it'll also be physically blown to smithereens.

Re: Telephone demarc boxes [Re: Donald] #5151241 07/04/19 11:56 AM
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Donald Offline OP
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Are the new phone company lightning protectors gas tube vs a carbon button?


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
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