Re: O/T electrical question

Posted by John T Dryer Update on September 21, 2006 at 06:47:13 from (66.244.90.5):

In Reply to: O/T electrical question posted by 37 chief on September 20, 2006 at 16:57:57:

WOW, now knowing the dryer is GAS really changes things. If its gas my guess is it only requires a 120 volt circuit versus a 240 as electric dryers might use. There are three options now, but I would still STRONGLY SUGGEST a seperate isolated circuit dedicated for the FREEZER ONLY.......

OPTION IF YOU HAVE AVAILABLE PANEL SPACE FOR 3 SINGLE POLE BREAKERS AND ARE GONNA DO THIS YOURSELF

1a) You could still run 3 totally seperate 120 volt circuits, one to washer one to dryer one to freezer, and it may be considered by some as "overkill". Each circuit would be fed by a 120 volt single pole 20 amp breaker in the panelboard with 12/3 wire (Black Hot, White Neutral, Bare/Green quipment Ground) to a 120 volt 3 prong grounding type NEMA 20R receptacle for the individual appliance.

OPTION IF YOU ONLY HAVE AVAILABLE PANEL SPACE FOR 2 SINGLE POLE BREAKERS

1b) Run a regualar 120 volt 20 amp circuit (NOT the multi wire) for BOTH the Washer n Dryer. Assuming they are setting side by side, a standard 120 volt 20 amp 3 prong grounding type NEMA 20 R Duplex Receptacle (served by 12/3 wire and a single pole 120 volt 20 amp circuit breaker in the panel) would have the 2 outlets for both appliances n youre offfffffff to the races. NOTE this depends on the actual loads but may work !! Then run another seperate 120 volt 20 amp circuit for the Freezer with a 120 volt single pole 20 amp breaker and 12/3 wire.

OPTION IF YOU HAVE 3 SPACES AVAILABLE IN THE PANEL AND PREFERABLY GONNA HAVE A PROFESSIONAL ELECTRICIAN DO THE WORK

2) You could run whats called a "multi wire branch circuit" to serve BOTH the washer n dryer. That would require a 2 pole 20 amp circuit breaker in the panel and 4 wires, 2 (Red n Black) Hots, one White Neutral, one Bare/Green Equipment Ground) to the 120 volt 20 amp NEMA 20R 3 prong grounding type appliance receptacles.

NOTE the Multi Wire Branch Circuit of 4 wires works by serving one receptacle (say dryer) on Phase A (one leg of 120 volts to Neutral) and the other (say washer) on Phase B (other leg of 120 volts) AND A SINGLE COMMON WHITE NEUTRAL. If the currents were equal on each Phase leg (NOT withstanding different lag angles caused by inductive or capacitive non pure resistive loads) the Neutral current would be zero. However, since the loads are high inductive being motors with poor power factors, there could well be some Neutral current even if the pure resistive loads were equal........ That circuit might be considered as more hazardous to a non electrician, since 240 volts (twice the voltage of a regular 120 volt branch circuit) is present across the 2 hot phase A and B wires while only 120 volts is present between the hot phase wire and Neutral (or ground) on the regular 120 volt branch circuit. It may be possible to use a duplex receptacle having the ties removed so each outlet can be served by a different phase wire, say Phase A Black feeding the top receptacle n Phase B Red feeding the bottom WITH A COMMON WHITE NEUTRAL and the bare/green equipment ground.

Then, of course, the other circuit for the Freezer ONLY

3) I WOULD NOT use this option, I doubt it would handle alllllllll 3 loads (depends on diversity and actual loads, but if freezer cycled at same time washer n dryer were running and/or cycled, breaker may well trip),,,,,,,,I suspect it may NOT be NEC permissible,,,,,,,,

It would be one 120 volt 20 amp circuit for alllllll three loads ITS A BAD IDEA AND LIKELY NOT EVEN PERMISSIBLE AND MAY NOT HANDLE ALL LOADS SCRATCH IT LOL

Hope this helps, I guess the options would be decided based upon how many spaces are available in the panel and if you or an electrician are gonna wire a multi wire branch circuit should that option be used.

Best wishes n God Bless, keep safe

John T Retired EE

Replies:

• Re: O/T electrical question 37 chief 10:47:37 09/21/06 (0)

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