In a message dated 7/3/2006 5:44:19 P.M. Eastern Standard Time,
jim@audiosystemsgroup.com writes:
In the 4-conductor connector, two contacts are the "hots" (that is,
each is 120 either side of neutral), one is neutral, and the fourth
must be a green equipment ground wire that bonds the equipment
enclosure and backbox. That is the only way to legally (and safely)
use a 4-wire 240/120 volt circuit.
73,
Jim K9YC
Right you are Jim!! One must understand that a "4" wire system here is
correctly referred to as a 240/120 volt circuit, not simply a 4 wire 240 volt
circuit. Also, as far as NEMA goes one should use the proper plug/receptacle
combo for the system they are matching. Some plugs have "4" pins and are
240/120 volt recognized some a "4" pin and 3 phase recognized. They have
different configurations, but should be used in the right combinations. One
of the
most common mistakes I have seen in electrical wiring done by the "ham" vs the
"electrician" is when one adds a sub-panel for the ham shack distribution
of AC power. Many do NOT separate the bonds from the neutrals in the
sub-panel which is a code violation. Lou
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