On Fri, 03 Feb 2012 17:04:31 -0500, RBM wrote:

On 2/3/2012 4:34 PM, Horace Greeley wrote:
On 2/3/2012 7:22 AM, RBM wrote:
On 2/2/2012 11:05 PM, wrote:

I've seen furnaces connected with a twist-lock plug - it meets the
requirement for a disconnect within reach of the furnace.(takes the
place of a switch) and is also a foolproof way of connecting to a
genset.

That maybe true in Canada, but it doesn't meet 422.16 of the Nec, in the
U.S., at least not for your garden variety central heating system.


Check with your local electrical inspector.

If done properly, ours said it was legal and safe to do the plug and
cord setup.

His only recommendation was to use a 12 gauge appliance cord set, proper
strain relief (not romex clamp) and a high-quality 20 amp receptacle.

That really makes no sense. Typical oil burner/ furnace is fed with a 15
amp circuit. It's either code compliant or it's not, regardless of size
or ampacity of cord and receptacle.

20 amp twist locks are a lot more common than 15 amp twist locks.