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Title: Identify - old house breaker or what? Post by: w5hro on July 06, 2010, 12:22:41 AM Just picked up this old knife switch box in an antique shop down in Santa Barbara yesterday.
The tag said it was an old circuit breaker maybe for a house. It has a glass cover that comes off via two twist nuts. Anyone ever seen or remember these? I thought I might use it to switch my antenna with the open wire line (ladder line) out into the garage. Title: Re: Identify - old house breaker or what? Post by: W7TFO on July 06, 2010, 12:38:55 AM Is a cutout device from a 3-phase commercial electrical meter panel. Used to isolate each phase E & I from CT's and PT's into the kWh meter.
Still in use, most modern ones are really crappy. :P Your older one is a cool switch for many uses. ;) 73DG Title: Re: Identify - old house breaker or what? Post by: N4LTA on July 06, 2010, 08:55:41 AM Yep - The switches keep the CT (current transformer) shorted while they are out of the meter circuit. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Otherwise you get an extremely high voltage when the CT tries to pump current through the open circuit - alot like a modulation transformer working into no load. |