[quote author="bcarso"]There's something to be said for switching both sides of the line (thus DPST) if you ever encounter a place that is wired with hot and neutral swapped.
Also some studios are getting wired with balanced power now, which means both sides of the line are hot relative to safety ground.[/quote]
What? I've wired a lot of studios, but I've never heard of such a thang. Here's a few specs I use when working in a sensitive audio enviroment.
TVSS - (Transient Voltage Surge Supressor) If I wrote the electrical codes, I'd require them on all services.
Main grounding to be 2 sizes larger than that required by NEC. Bonding to include cold water, structural steel, gas piping (if present), and physical earth.
All 20 amp branch circuits to use #10 standed conductors.
No neutral sharing among branch circuits.
All control room circuits to be on the same phase.
No lighting combined with receptacle circuits.
Dimmers to be Nova magnetic sized at 200% maximum load.
Grounding Grounding Grounding!!!!! I've made a few studio owners happy campers after cleaning up their electrical systems.
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To answer the original question, a SPST switch is sufficient for a power switch as long as you've used a polarized cord. This doesn't protect you from faulty premisis wiring.
