# Single phase dryers on 3 phase service

#### Dconger74

##### Member
Hello, new here. I am studying so that I can pass my Master exam. I want to be prepared so I am asking if anyone could give and example of what I posted in the title. Mike’s textbooks show examples for cooking equipment but not dryers. I believe it is the same procedure as cooking equipment except you use table 220.54. Just want to be sure. Thanks.

#### infinity

##### Moderator
Staff member
Are you asking about an Article 220 service calculation with 1Ø dryers on a 3Ø system?

Welcome to the forum.

#### Dconger74

##### Member
Yes Sir. Thank you.

#### LarryFine

##### Master Electrician Electric Contractor Richmond VA
DC, welcome to the forum.

Rather than code items, let me explain this: a clothes dryer has everything connected from L1 to the neutral, except for the heating element.

A 240v heating element runs at almost exactly 3/4 the wattage on 208v as on 240v. The rest of the dryer's internals run on 120v either way.

#### kwired

##### Electron manager
DC, welcome to the forum.

Rather than code items, let me explain this: a clothes dryer has everything connected from L1 to the neutral, except for the heating element.

A 240v heating element runs at almost exactly 3/4 the wattage on 208v as on 240v. The rest of the dryer's internals run on 120v either way.

That is the simple part, calculating load with allowed demand factors on a three phase supply is the part that is complicated, and even on this site you get varying opinions on how it should be done.

#### Dennis Alwon

##### Moderator
Staff member
Yes, it is the same for dyers as it is for ranges