Dedicated ckt for garbage disposal per 2011 NEC?

Status
Not open for further replies.
T

tld38

Member
Location
Cleveland
Hello to all! was told by my friend, that the inspector required him to have the garbage disposal on it's own dedicated ckt. Per the 2011 NEC. He said that the inspector even broke out his code book and showed him. My friend could not remember the section that he looked at though. Is this a new requirement per 2011 NEC change? I have never heard of this. I'm wondering if the inspector is using something out of Article 430. The inspector also required the dishwasher to have it,s own dedicated ckt as well. Always appreciate the guidance here.
 
manufacturer specs typically state equipment to be on a separate circuit.
I have even seen this on a high efficiency hot water tank, a 1.5 amp draw on the inducer motor and the specs called for a separate circuit LOL
 
Depending on the name plate amps it could require an individual branch circuit.

210.23(A)(2) Utilization Equipment Fastened in Place. The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed 50 percent of the branch-circuit ampere rating where lighting units, cord-and-plug-connected utilization equipment not fastened in place, or both, are also supplied.
Click to expand...
 
tld38 said:
Hello to all! was told by my friend, that the inspector required him to have the garbage disposal on it's own dedicated ckt. Per the 2011 NEC. He said that the inspector even broke out his code book and showed him. My friend could not remember the section that he looked at though. Is this a new requirement per 2011 NEC change? I have never heard of this. I'm wondering if the inspector is using something out of Article 430. The inspector also required the dishwasher to have it,s own dedicated ckt as well. Always appreciate the guidance here.
Click to expand...

What else is on the circuit?
 
dedicated ckt for garbage disposal.

dedicated ckt for garbage disposal.

There is a dedicated ckt for disposal, also a dedicated ckt for dishwasher. I have never seen a disposal Draw more than 1 HP. So 746 watts = 1 Horse, and 746/120 =6.2 amps. Even on a 15 amp ckt that is shared, this does not exceed 50%. I have no info on what the manufacturer data is.I,m just curious where in the 2011 NEC this is prohibited. Again, Thanks in advance to all members for their valuable time. I,m just telling my friend that nowhere in the 2011 NEC, can I find anything that requires a disposal to be on a individual branch ckt.
 
Whirlpool Gold Top Control Dishwasher; Model # WDT710PAYM draws 15amps.

A Insinkerator Evolution Compact Disposer is ? hp and draws 8.1 amps

According to 210.19 (A)(1) This would be a code violation even for a 20 amp circuit
 
tld38 said:
There is a dedicated ckt for disposal, also a dedicated ckt for dishwasher. I have never seen a disposal Draw more than 1 HP. So 746 watts = 1 Horse, and 746/120 =6.2 amps. Even on a 15 amp ckt that is shared, this does not exceed 50%. I have no info on what the manufacturer data is.I,m just curious where in the 2011 NEC this is prohibited. Again, Thanks in advance to all members for their valuable time. I,m just telling my friend that nowhere in the 2011 NEC, can I find anything that requires a disposal to be on a individual branch ckt.
Click to expand...

That formula is pretty much useless in this context. According to T430.248 for a true 1 HP motor operating at 115 volts the load would be 16 amps.
 
tld38 said:
There is a dedicated ckt for disposal, also a dedicated ckt for dishwasher. I have never seen a disposal Draw more than 1 HP. So 746 watts = 1 Horse, and 746/120 =6.2 amps.
Click to expand...

Motors are not 100% efficient so forget the 746 for pretty much anything to do with the NEC.


I have no info on what the manufacturer data is.I,m just curious where in the 2011 NEC this is prohibited.
Click to expand...

Well the nameplate rating what you would need to know.

I posted a section above that could require an individual branch circuit for this.

Here is a link to a 1HP disposer it uses 12 amps http://www.lowes.com/pd_240431-712-EXCEL_0__

Here is a link to a 3/4 HP it uses close to 10 amps. http://download.sears.com/docs/spin_prod_786120412.pdf
 
Dedicated ckt for garbage disposal per 2011 NEC?

Thanks to all for the clarification. The nameplate says everything! Being that the electrical was roughed in before electrician had any knowledge of appliance nameplate info, it would be a good idea to simply run a dedicated ckt for the disposal, and a dedicated ckt for the dishwasher as well. That way he is covered no matter what. Thanks again for everyone`s time.
 
Horsepower

Horsepower

iwire said:
Motors are not 100% efficient so forget the 746 for pretty much anything to do with the NEC.
Click to expand...

I am beginning to learn alot about the various meanings of the term horsepower as defined by different industries. I have a 10 horsepower diesel engine that weighs 600 Lbs. and a couple of weeks ago I rode in a small pontoon boat that had a 50 horsepower engine that probably didn't weigh more than 100 Lbs.
A couple of years ago I replaced a 1/2 hp well pump with a 'Utilitech' brand and the 'Utilitech' brand could not pump the water so I returned it for a 1hp.
I like telling customers with 500-watt halogen lamps that they have 2/3 hp per lamp. That usually helps them realize how much energy they are dealing with.
 
I have rarely had to install a new circuit for a disposal. Generally I may install them off the kitchen lights however that would be a code violation in this case on a 15 amp cir. Personally I think the NEC needs an exception for situations such as this and garage door openers.

The motors are on for such a short period that they would never blow the circuit. The dishwasher generally only pull 15 amps when the heating elements are on so there is only a brief time where they could even possibly be an issue.
 
Status
Not open for further replies.
Top