What type of receptacle for an Air Cond.

[hellosailor]

"but they should have a safety disconnect switch. "

Axe with fiberglass handle. Pretty much can disconnect everything.

Why is it they've gone out of fashion anyway?

[GordMay]

Originally Posted by avazquez

Is there a recomended particular plug connection for things like air conditioners, water heaters etc. other than the regular domestic receptacle? Twist on?

20A 3P 120V Locking Devices:
NEMA Configuration L5-20R Twist-Lock Receptacle , and L5-20P Cord Cap (male).

[Beausoleil]

Originally Posted by GordMay

Appliances that come with a cord & cap set, for plug-in use, can be hard wired as you describe; but they should have a safety disconnect switch.
As supplied, the appliance can be quickly disconnected (without the use of tools) by removing the cap from the receptacle.

You could substitute a “Horsepower Rated” 2-pole switch, in lieu of the proposed terminal block.

I should have mentioned that it will be fed by a breaker on the AC panel - that should suffice as the safety disconnect right?

Sorry, my background's in telecom/networking, not power - but I did sleep at a Holiday Inn Express last night... Does that count?

[GordMay]

The safety disconnect should be within sight of the equipment.

[Pblais]

I should have mentioned that it will be fed by a breaker on the AC panel - that should suffice as the safety disconnect right?

Yes that would the best choice. It's where they all can be shut down in case of an emergency.