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#111173 - 09/11/06 06:53 PM Telephone Installation
Webmaster Offline


Registered: 10/07/00
Posts: 3142
Loc: NY, USA
When telephone companies were deregulated anyone could buy a pay phone and install it. The phone company would supply a line but the owner had to provide 120 volt to make it operate. The hose & clamps made an interesting no-thread coupling.

Alan Nadon

2014 / 2011 NEC & Related Books and Study Guides
#111174 - 09/11/06 07:41 PM Re: Telephone Installation
ShockMe77 Offline

Registered: 06/11/05
Posts: 823
Loc: Rahway, New Jersey
Is the coupling there so it doesn't leak?

#111175 - 09/11/06 11:02 PM Re: Telephone Installation
napervillesoundtech Offline

Registered: 02/28/06
Posts: 144
Loc: Naperville, IL, USA
probably, you wouldn't want to waste any electrons due to leaky pipes

#111176 - 09/12/06 03:29 AM Re: Telephone Installation
pauluk Offline

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Looks like the zig-zaggy run is also part of the scheme -- It makes the electrons slow down to go through that coupling!

#111177 - 09/12/06 08:04 AM Re: Telephone Installation
sabrown Offline

Registered: 12/12/02
Posts: 297
Loc: Ogden, Utah, USA
It looks like the original installation was shy on support for the EMT with only one clamp (now uunused) on the booth itself but nothing within 3' of the other end. EMT was (according to what we see now) a poor choice. Rather than replace the damaged conduit or even bend it back into a semblance of its original shape, and, because the original fitting would no longer span the joint, the hose and clamping solution is a poor substitute.

As I look at the damage to the conduit, I would say that this conduit was hit by a car bumper. So would IMC even held up? IMC encased in 2" of concrete across the sidewalk or even properly saw cut into and buried under the sidewalk still would not of held up to a car bumper.

EMT and fittings would not have held up for typical damage due to raised elevation above grade and someone just stepping on it.

I also find the strapping of the box for support interesting.

#111178 - 09/12/06 12:12 PM Re: Telephone Installation
Trumpy Offline


Registered: 07/05/02
Posts: 8532
Loc: SI,New Zealand
Is there a disconnect on that box?.
Reason I ask that is because, I'd hate to be making a call and have some impatient guy, switch the phone off on me.
Let's face it, these days if you're not young, you're old - Red Green grin

#111179 - 09/12/06 06:36 PM Re: Telephone Installation
blackrd Offline

Registered: 03/10/05
Posts: 25
Loc: shorewood,il, USA
The 120v is for the booth lighting.
The telco provides a diffrent dial tone for payphones. Most never notice the difference.

#111180 - 09/13/06 03:16 AM Re: Telephone Installation

Registered: 12/08/05
Posts: 862
Loc: Titirangi, Akld, New Zealand
Makes you wander if there is an earth wire in that conduit.
It wouldn't be great to rely on that rubber bonded link for an earth if the conduit was the earth conductor.
The product of rotation, excitation and flux produces electricty.

#111181 - 09/14/06 01:13 AM Re: Telephone Installation
Luketrician Offline

Registered: 07/08/06
Posts: 273
Loc: Sale Creek, TN USA
Luke Clarke
Electrical Planner for TVA.


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