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Hank©[_2_]

On 5/2/2013 2:05 AM, wrote:
On Thu, 02 May 2013 00:48:31 -0400, Hank©
wrote:

On 5/1/2013 10:08 PM, wrote:
On Wed, 01 May 2013 22:20:10 -0400, Hank©
wrote:

On 5/1/2013 8:29 PM, Wayne B wrote:
On Wed, 01 May 2013 20:05:45 -0400, wrote:

This came about because the 2 wire devices do not work with LEDs and
CFLs. They work OK with incandescents.

===

For us laymen, can you explain why that is?

I'd like to know too. I have almost 40 LEDs working with 2 wires. There
are of course three wires in the fixture but one of them is ground and
not part of the circuit.

The 3 wires are at the switch and it is required if you use electronic
switching and don't power the circuit through the load.
That would be typical of any occupancy sensor or timer that is a drop
in replacement for a snap switch.
In some of my applications I use the regular motion detector heads you
use outside and they have a relay for the switch so they will run
anything but you need a neutral for them.

I'll have to take your word for it. I wasn't aware that a ground is used
to complete a live circuit. Sounds hokey to me but I won't argue with you.

They used the ground for the electronics in some of the old designs
and the U/L standard was 500ua.

That would still be 1/10th of what it takes to trip a GFCI so it was
not seen as a safety issue.

Sounds like you'd have some pretty confused electrons running around if
you used many of those sort of devices.