Washer and dryer overcurrent protection size

[hhsting]

I have 3.8kw washer at 208v single phase, 18A FLA and 4.16kw dryer at 208V single sing phase at 20A FLA.

Based on above 18x1.25= 22A which is 25A breaker and 20x1.25=25A which is also 25A breaker.

I searched in appliance section NEC 2017 section 422 but not sure which section applies for sizing overcurrent protection of the washer and dryer.

Which NEC 2017 Article section applies for sizing of washer and dryer breaker size? Would 25A be ok or 30A be ok?

 

[d0nut]

What are the plugs on the units?

 

[Dennis Alwon]

What are the plugs on the units?

what does that have to do with the question?

I think either 25 or 30 would work although I can't find anything that defines what to do with an appliance that is both a motor and a heating element.

 

[Rock86]

What does the manufacturer specify for MOCP? (If you don't have the data sheets, look up the make and model online. there should be one. )

 

[d0nut]

what does that have to do with the question?

Manufacturers don't always do the best job of labeling the equipment or the cutsheets with what is actually required. If the washer and dryer have 20A plugs on them, they would need 20A circuits and the questioning of 25A or 30A would be moot. If they have 30A plugs, then it would take a little more digging into what the MOCP actually is.

 

[Rock86]

Manufacturers don't always do the best job of labeling the equipment or the cutsheets with what is actually required. If the washer and dryer have 20A plugs on them, they would need 20A circuits and the questioning of 25A or 30A would be moot. If they have 30A plugs, then it would take a little more digging into what the MOCP actually is.

What if they are hardwire units without plugs? Granted, for these appliances, the OP is probably fine with either or. Its just nice to know all of the facts.

 

[infinity]

what does that have to do with the question?

I think either 25 or 30 would work although I can't find anything that defines what to do with an appliance that is both a motor and a heating element.

Why am I thinking that there is a 150% rule.

 

[hhsting]

What if they are hardwire units without plugs? Granted, for these appliances, the OP is probably fine with either or. Its just nice to know all of the facts.

These are not hardwired but have special receptacles on the plans

 

[jap]

I think what Donut was getting at was what most of us do.

Look at whatever cord end is on the unit if it has one, match it up with a receptacle, and, feed the receptacle with whatever amperage the cord end is.

Now, if it's hard wired then that's a different story and some math probably needs to be done if not indicated.

If not hard wired, and the plans show "special" receptacles, I'd like to know how they came up with those "special" receptacles without knowing what male cap was on the cords of the washers or dryers.

JAP>

 

[Rock86]

These are not hardwired but have special receptacles on the plans

Do you have a make/model of the appliances?

 

[Rock86]

I think what Donut was getting at was what most of us do.

Look at whatever cord end is on the unit if it has one, match it up with a receptacle, and, feed the receptacle with whatever amperage the cord end is.

Now, if it's hard wired then that's a different story and some math probably needs to be done if not indicated.

If not hard wired, and the plans show "special" receptacles, I'd like to know how they came up with those "special" receptacles without knowing what male cap was on the cords of the washers or dryers.

JAP>

I'd agree with that.

 

[Dennis Alwon]

Why am I thinking that there is a 150% rule.

That is for non motor...422.11

(E) Single Non–Motor-Operated Appliance. If the branch
circuit supplies a single non–motor-operated appliance, the
rating of overcurrent protection shall comply with the following:
(1) Not exceed that marked on the appliance.
(2) Not exceed 20 amperes if the overcurrent protection
rating is not marked and the appliance is rated
13.3 amperes or less; or
(3) Not exceed 150 percent of the appliance rated current if
the overcurrent protection rating is not marked and the
appliance is rated over 13.3 amperes. Where 150 percent
of the appliance rating does not correspond to a standard
overcurrent device ampere rating, the next higher standard
rating shall be permitted.

 

[infinity]

I have 3.8kw washer at 208v single phase, 18A FLA and 4.16kw dryer at 208V single sing phase at 20A FLA.

Based on above 18x1.25= 22A which is 25A breaker and 20x1.25=25A which is also 25A breaker.

I searched in appliance section NEC 2017 section 422 but not sure which section applies for sizing overcurrent protection of the washer and dryer.

Which NEC 2017 Article section applies for sizing of washer and dryer breaker size? Would 25A be ok or 30A be ok?

Why add 25%?

 

[roger]

These are not hardwired but have special receptacles on the plans

You say you are a plan reviewer has it occured to you to ask for the spec sheet on unit(s)

Roger

 

[Dennis Alwon]

Why add 25%?

I was thinking that a washer is a motor so 25% is appropriate. For overcurrent protective device it states use art 430 for motor operated appliance.

422.10 Branch-Circuit Rating. This section specifies the
ratings of branch circuits capable of carrying appliance current
without overheating under the conditions specified.
(A) Individual Circuits. The rating of an individual branch
circuit shall not be less than the marked rating of the appliance
or the marked rating of an appliance having combined loads as
provided in 422.62.
The rating of an individual branch circuit for motor operated
appliances not having a marked rating shall be in
accordance with Part II of Article 430.
The branch-circuit rating for an appliance that is a continuous
load, other than a motor-operated appliance, shall not be
less than 125 percent of the marked rating, or not less than
100 percent of the marked rating if the branch-circuit device
and its assembly are listed for continuous loading at
100 percent of its rating.
Branch circuits and branch-circuit conductors for household
ranges and cooking appliances shall be permitted to be in
accordance with Table 220.55 and shall be sized in accordance
with 210.19(A)(3).

 

[infinity]

I was thinking that a washer is a motor so 25% is appropriate. For overcurrent protective device it states use art 430 for motor operated appliance.

I agree but what do you think that the odds are that these units are not marked with the OCPD right on the nameplate?

 

[Dennis Alwon]

I agree but what do you think that the odds are that these units are not marked with the OCPD right on the nameplate?

I suspect it is written on the unit, however he only has plans and apparently the specs are not always correct nor complete

 

[roger]

I suspect it is written on the unit, however he only has plans and apparently the specs are not always correct nor complete

So he should only be concerned with the information he has, speculation beyond that is a waste of time. Typically a reviewed plan comments would state provide correct receptacle / termination and OCPD

Roger

 

[Dennis Alwon]

So he should only be concerned with the information he has, speculation beyond that is a waste of time. Typically a reviewed plan comments would state provide correct receptacle / termination and OCPD

Roger

I agree.....I guess if he figures a 30 amp for estimating that would take care of it. Not much you can do without all the info.