This is still present in the 2005 NEC but notes show it has been
edited.

Mike M


250.140 Frames of Ranges and Clothes Dryers. Frames
of electric ranges, wall-mounted ovens, counter-mounted
cooking units, clothes dryers, and outlet or junction
boxes that are part of the circuit for these appliances
shall be grounded in the manner specified by 250.134 or
250.138.
Exception: For existing branch circuit installations only
where an equipment grounding conductor is not present in
the outlet or junction box, the frames of electric ranges,
wall-mounted ovens, counter-mounted cooking units, clothes
dryers, and outlet or junction boxes that are part of the
circuit for these appliances shall be permitted to be
grounded to the grounded circuit conductor if all the
following conditions are met.
(1) The supply circuit is 120/240-volt, single-phase, 3-wire;
or 208Y/120-volt derived from a 3-phase, 4-wire, wyeconnected
system.
(2) The grounded conductor is not smaller than 10 AWG
copper or 8 AWG aluminum.
(3) The grounded conductor is insulated, or the grounded
conductor is uninsulated and part of a Type SE serviceentrance
cable and the branch circuit originates at the
service equipment.
(4) Grounding contacts of receptacles furnished as part of
the equipment are bonded to the equipment.


On Tue, 13 Nov 2007 11:41:36 -0600, Frank Boettcher
wrote:


Well, cabinet trim went fine, range fits and is centered (probably
should have greased the sides a bit goilg in) currently wiring the new
range.

romex into the 50 Amp wall plug is three wire, which was code
acceptable then and now for reinstallation. However, old range was
wired with a four wire plug. Nuetral and ground are tied together in
the male end of the plug (which I am reusing).

four wire hookup calls for hooking up black, white (nuetral) and red
on the terminal block and *removing* a bonding strap from the ground
screw to the nuetral terminal on the ground, then attaching the ground
wire to the now chassis only ground screw.

Three wire hook up calls for black, white (nuetral) and red, no ground
wire and leaving the bonding strap in place.

I'm going to assume that the former is better despite the fact there
is no separate nuetral and ground returning to the box, they are at
least separate leaving the appliance.

Or maybe it doesn't matter?

Frank