According to Mike's diagram "Figure 422-7" using a 30A plug and a Dryer Pigtail is not allowed anymore? It seems that 422.16. A 1 & 2 says that we can if "the appliance is intended or identified for flexible cord connection." It seems like there is NOT agreement here between Mike Holt and the NEC? Please clarify. Kitk T.
Disconnect for fastened in place Hot Water Heaters
- Thread starter KTK
- Start date
- Status
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Dryer pigtail would be incorrect anyway since most water heaters are straight 208/240.
UL listing (KSDT) on household storage water hesters states:
These water heaters are intended for household use and permanent connection to the supply source in accordance with ANSI/NFPA 70, ‘‘NationalElectrical Code.’’
Art 422 does allow for the use of a "breaker lock"in lieu of a disconnect
These water heaters are intended for household use and permanent connection to the supply source in accordance with ANSI/NFPA 70, ‘‘NationalElectrical Code.’’
Art 422 does allow for the use of a "breaker lock"in lieu of a disconnect
texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
I once wired a house that was so nice, I didn't want to install a typical disco for the water heater, so I used a 30a 2p toggle switch.
Fred B
Senior Member
- Location
- Upstate, NY
- Occupation
- Electrician
Sorry, excuse me, but I'm totally unaware or even heard of such as an issue before. Always just turn off breaker for a wated heater. Is there something I've missed that requires something in addition to the breaker to shut off and disconnect a WH? Please educate me, code references too please so that I can share the info.
Also, if never heard of such a thing as wiring a water heater with a plug. The only ones I've come across are single pole 120V plug in.
Also, if never heard of such a thing as wiring a water heater with a plug. The only ones I've come across are single pole 120V plug in.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Perfectly okay if within sight and 50 feet; usually dependent on being in the same room.
rnatalie
Senior Member
- Location
- Catawba, NC
- Occupation
- Retired Electrical Engineer
The disconnect was never required to be "near" the HWH. It needs to either be "within sight of" it or able to be locked in the open position.
Fred B
Senior Member
- Location
- Upstate, NY
- Occupation
- Electrician
Does a LOTO device count or does the breaker have to have the permanent device installed on the breaker?
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
The idea is that someone cant unwittingly re-energize the circuit until the service person has finished.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
See 110.25 for requirements for lockable disconnecting means. For water heaters, there has long been a requirement for a lock out on the disconnecting means if its not in sight.
Note this requirement does not apply to hot water heaters. No need to heat hot water.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Seems to me that a cord and plug connection for a furnace or boiler shouldn't be allowed either since it's fastened in place.
-Hal
-Hal
texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
It's not. See 422.16.
- Status