Bob Vaughan wrote:

In article 7ZyZg.155882$1T2.95555@pd7urf2no,
Randy Day wrote:

I'm looking for an electrical coupling to provide 120VAC
to equipment on a rotating platform. The platform can
only turn one way, so it can't have wires up the hub.

Is there a commercial product out there, and if so, what
is it called? None of the electrical places I talked to
knew of anything like this...



It's called a slip ring, sometimes called a commutator ring (a commutator
ring is a specialized type of slip ring.)

http://www.mercotac.com/html/products.html
http://www.uea-inc.com/slip/index.html
http://www.polysci.com/SlipRings/slipring.html

That's the kind of thing I'm looking for. Thanks much!