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In Reply to: RE: Balanced Transformer - On/Off Switch Question posted by Comfortably Dumb on November 12, 2007 at 12:36:14
Since both legs of balanced power are hot, yes the neutral side of the preamp's internal wiring will be "live."
Follow Ups:
Ok. So what is the conventional wisdom in this case regarding what gets turned on and off?
Is it better to turn the TX on/off for each listening session or just leave it on knowing that the connected equipment will always be in some semi "on" position?
I was thinking that turning the TX on/off (say after each session) would put quite a stress on the TX and should be avoided, however I'm not sure I want my equipment in a semi "on" position either.
Thanks Glen
The only problem you would face is if you open up your equipment while it is plugged into balanced power and go poking around inside -- something you should not do anyway unless you have a death wish. My components that have been operating on balanced power the past few years all have SPST switches. I have had no problems.
nt
The preamp will still be off if the switch is off. No current flow..... The switch breaks the circuit.
Ok. So there should be no issues/hazards with using balanced power and other equipment with a SPST switch in the off position?
I bring it up because I read the FAQ section of Equitech's site about an issue with equipment with single pole switches tripping the GFCI's in a balanced transformer?
The article was unclear and I'm not sure of the specifics, but it did mention SPST switches.
Thanks.
The best thing to do is to use a double pole switch. This will open both sides of the line. Two fuses would be a good idea as well.
Not sure if I understand, but yes, the balanced Tx will have it's own DPST switch and circuit breaker.
However, I would rather not have to turn the Tx on/off continually, but I guess I will if there is any issue/hazard to having -60V on the neutral line of any equipment with only a SPST switch.
Thanks
The DPST switch goes in the audio equipment. The balanced Tx should get a switch and fuse on its primary as well, but in most cases can be a SPST switch and a single fuse.
The problem is that IF the secondary (output) of your balanced Tx has a center tap that is connected to earth then BOTH output lines are hot with respect to earth. This means that both are a shock hazard and therefor need to be switched and fused. You can leave the balanced Tx on all the time if you wish AS LONG AS you treat its output as if it is mains power.
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