TELECOM Digest OnLine - Sorted: Re: 208/240V, was: 25 Hz Power

Re: 208/240V, was: 25 Hz Power

John McHarry (
Sun, 12 Mar 2006 22:08:59 GMT

On Sun, 12 Mar 2006 01:14:11 +0000, TELECOM Digest Editor noted in
response to Danny Burstein:

> [TELECOM Digest Editor's Note: I know of a janitor in an apartment
> building who always used 25 watt _240 volt_ light bulbs in the
> exit signs in his building (even though the fixures were the more
> standard and customary 120 volts.) He said those 240 volt bulbs
> (which were in difficult to reach places) _never_ had to be changed;
> they would on burning for several years. He did not like the idea of
> getting out a step ladder to climb up and change a bulb in an exit
> sign if he could avoid it. PAT]

They used to sell little button devices to put in a lamp socket that did
pretty much the same thing with an ordinary 120v bulb. I think it was a
diode to block ever other half cycle.

[TELECOM Digest Editor's Note: And did you ever notice how the output
from the bulb is always sort of a soft, golden color? I wonder what
would happen if you used a 240 volt bulb in a socket with one of those
button devices you mentioned as well? Probably some very feeble light
would result. PAT]

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