"...All of the receptacles specified for power
> amplifiers are 3 wire, four pole grounding. (NEMA L14-20R)"
NEMA L14-20R is 3 pole, 4wire.
"...he said he could not endorse an 2 wire, three pole grounding (NEMA
> L6-20R) configuration due to liability reasons."
And L6-20R is 2 pole, 3wire.
Both locking receptacles utilize a ground conductor, so I don't know what
liability the PE is referring to. In any event, he did you the favor so
that all new and most older commercial amps can be used -- although an
L14-30R and 30A service would have been preferred if ever dragging a 77Sx
into the shack.
Paul, W9AC
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