stevemorris wrote:
sayoung wrote:
Learjet wrote:
As I said in post #2 do it right and add the circuit. The double 240 or if you have some single 120 CBs you can get those in double to make space for another standard 240 breaker. :)
I had a thought , the 3rd wire on the dryer is not normally a current carrying wire but actually safety gnd so I wouldn't piggy-back these outlets. Maybe I was taught wrong years ago when gnd added to wireing code , was taught to never use the gnd for current carrying, it's there for protection.
this is incorrect. Both driers and stoves(household types) require the 120 as well as 240. Remove the neutral and they wont work. the control boards, clock, motors etc etc require 120, hence the neutral
Drier circuits at one time it WAS acceptable to wire with NO Neutral (AKA "three wire") with two hot and one GROUND.
The drier motor and timer are 120V and did indeed use the GROUND WIRE in order to get the needed 120V to operate.
The EXISTING three wire drier circuits are "grandfathered" and are still allowed, you cannot how ever install a three wire drier circuit in a new installation.
NEC made the change a few yrs back to require FOUR wire drier circuits in order to eliminate the potential issue of current being carried on the SAFETY GROUND WIRE. So, new drier circuit installations now require four wire 240/120V..
Driers ARE designed to be able to be setup for 3 wire OR 4 wire via a removable jumper between the safety ground connection and the Neutral connection on the drier terminals.
As far as the OPs setup, the only issue I see with the double breakers is many boxes which do accept those breakers do not have enough ground and Neutral buss bar connections. This may require doubling up on the ground and Neutral wires on the buss bars. Some electrical inspectors may be OK with that and some may not.
I will toss in an additional idea..
Add on a small manual generator transfer panel, feed the transfer panel via a 100A 240V double pole breaker from the main panel, move a few "critical" house circuits to the transfer panel. This will now free up some spaces to put your RV 240 breaker and give you the option for a generator power backup system.. Kill two birds at one time..
