On Tue, 24 Sep 2019 21:05:11 -0400, wrote:

On Tue, 24 Sep 2019 16:21:28 -0700 (PDT), trader_4
wrote:

SNIPP
Why you need a disconnect on a water heater, but not AFAIK on direct
wired ovens, cook tops, or a dishwasher, IDK.
IDK

I agree with you. 422.30 certainly makes it sound like a wall mounted
oven or hard wired cook top should have a disconnect unless there is a
locking device on the breaker but I don't see it done. Ranges are
typically cord and plug connected and as long as you can reach that
plug without pulling out the range by "removing a drawer" it is legal.
The unit switch on the dishwasher is probably the disconnect if it has
an "off" position. Water heaters are dealt with because it is likely
the plumber will be doing the entire replacement and if there is a
disconnect there, he can work safely without really knowing much about
electricity. Most AHJs will require a permit for a water heater
replacement and they will want to see the disconnect there if the
panel is not within sight. There has been an argument about whether
one of those mechanical Intermatic timers is a disconnect but since
the "on" tripper overrides the manual "Off" lever most AHJ's say no.

Furnaces and water heaters and air conditioners require a disconnect
device within sight of the device - both electric and fuel, by the
way, for heaters and furnaces - - - On a power vent gas water heater
the plug-in connection counts as the disconnect - and in SOME places a
"dedicated" twist lock outlet for the furnace is also allowed in place
of a switch