![]() This should be rectified, lest an open neutral cause the stove's chassis to go hot. Furthermore, the old-style NEMA 10-50s lack a ground, instead using the neutral as ground. Furthermore, it is sanctioned by NEC 210.22:Ģ10.22 Permissible Loads, Individual Branch Circuits.Īn individual branch circuit shall be permitted to supplyĪny load for which it is rated, but in no case shall the loadįinally, do check the wiring - 8AWG wiring goes with a 40A breaker, and 6AWG wiring with a 50A. Second, the breaker protects the wiring of the branch circuit - plugging a 40A range into a 50A circuit is simply a bigger form of plugging a 1A radio into a 15A circuit, something we do all the time. (Other places in the Code also use the verbiage "the receptacle rating shall be no less than the branch circuit rating".) (We already have a zillion flavors of receptacle, so why add more?) So, the Code says to use 50A receptacles on 40A branch circuits to begin with - this is in 210.21(B) and its associated table. Then you can upgrade the connectors to NEMA 14-50 type and change the jumper on the appliance to use a separate ground.įirst - there is no NEMA 10-40 or 14-40 plug or receptacle, only the 10-50 and the 14-50. (Grounds don't have to travel with the conductors). A ground wire can be retrofitted using any viable route back to the panel. If it's an old NEMA 10-50 type, it does not have a ground wire, and any problem with the neutral can electrify the chassis of the stove, a potentially lethal situation. This is a good time to look at the receptacle. I would downgrade the breaker to 40A for an extra bit of safety. I am not sure whether it is legal to plug a 40A rated appliance into a circuit breakered for 50A. ![]() With large circuits like this, there is only one appliance per circuit. If the wire is 6 AWG, the breaker may be 40 or 50 amps (or any value up to 50A). The circuit breaker must be no larger than the wiring is fit for - if the wiring is 8 AWG, the breaker must be 40A (or smaller). (There are enough varieties of receptacle already!) The exception is because 40A receptacles do not exist, or rather, are not part of the NEMA standards. Using a 50A plug and receptacle is allowed on a 40A circuit because of an exception in the Electrical Code.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |