Announcement

Collapse
No announcement yet.

Single phase dryers on 3 phase service

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Single phase dryers on 3 phase service

    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.

    #2
    Are you asking about an Article 220 service calculation with 1Ø dryers on a 3Ø system?

    Welcome to the forum.
    Rob

    Moderator

    All responses based on the 2017 NEC unless otherwise noted

    Comment


      #3
      Yes Sir. Thank you.

      Comment


        #4
        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.
        Master Electrician
        Electrical Contractor
        Richmond, VA

        Comment


          #5
          Originally posted by LarryFine View Post
          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.
          I live for today, I'm just a day behind.

          Comment


            #6
            Yes, it is the same for dyers as it is for ranges
            They say I shot a man named Gray and took his wife to Italy
            She inherited a million bucks and when she died it came to me
            I can't help it if I'm lucky

            Comment

            Working...
            X