On Saturday, August 4, 2012 5:13:02 AM UTC-7, John G wrote:
I have a home intercom in a two story condo from 1963.

The intercom has three built in wall units that were

installed at the time of construction. One unit is

outside next to the front door and there is a unit

on each floor. There are eight apartments and they all

have the same type of intercom. Below the first floor

is a parking area and above the second floor is a

flat roof. The power source for the intercom is not

behind any of the units and don’t seem to be in the

parking area or on the roof. I checked some of the

closets but I didn’t go through them inch by inch.

The units seem to have some power coming in so I

assume that the power source is still somewhere and

operational. I would like to locate the power source

without having to buy a three thousand dollar cable

tracker and would appreciate any input as far as

what the usual location might be when installing

a power source for intercoms of this type for similar

layouts?





*If it is a remote transformer it is supposed to be accessible. Usually

the easiest place for installation is on or near the electrical panel, but

in a condo it could be almost anywhere. I suggest flipping each circuit

breaker off one at a time to see which one shuts down the intercom power.

If it is connected to an outlet or lighting circuit, that may help narrowing

the location down. Did you open up the electrical panel to see if anything

was inside or seem to be attached to the exterior of the panel, but in the

wall? Is there an attic space that you get up into and look around?

I didn’t try turning off the breakers to narrow down the location because it is a very small condo but it’s better than nothing, I will try that. I didn’t think of opening the service electrical panel because I didn’t think they would put low voltage in with high voltage but now that I think about it who know what they would have done in 1963. I will also try that. There is no attic at all. Thank you for the suggestions.