Jump to content

3 phase panels


Phillip
 Share

Recommended Posts

That data-plate's too fuzzy to read, but surely there's nothing in the house that requires three-phase power.

Is it possible the installation of a three-phase service was intended to supply more juice to the house than the 60- or 100-amp service that was typical for 1958?

Link to comment
Share on other sites

Originally posted by Phillip

No shop on the grounds. It was installed for the heating and cooling systems. There are lumber mills close by. This may be why there is 3 phase to the home.

That's surprising since back in the 50's the houses didn't require that much power. No air conditioners, maybe one TV, no computers, printers, etc. It sounds like the house doesn't have electric water heater, stove and furnace.

I'm surprised nobody has switched completely over to single phase since then.

Link to comment
Share on other sites

  • 6 months later...

Three phase power is more economical for motors than single phase. I wish I had it for my A/C. Lots of homes in Albany, Ga have three phase for their A/Cs. Some are in single phase panels with a three phase style breaker which has an input for the third leg and outputs for all three phases. I put a label in these types of panels that this breaker and the main breaker need to be turned off to remove all power from the building.

Link to comment
Share on other sites

It's actually pretty common in what used to be farming areas or old horse stables, turned residential. All a matter of the lines on the street being 3-phase or not. I wish mine was, I've got a more then 100 year old, 20" bandsaw with a 3-phase 1.5 horse motor that I just can't seem to find a good single phase replacement for.

Link to comment
Share on other sites

It's actually pretty common in what used to be farming areas or old horse stables, turned residential. All a matter of the lines on the street being 3-phase or not. I wish mine was, I've got a more then 100 year old, 20" bandsaw with a 3-phase 1.5 horse motor that I just can't seem to find a good single phase replacement for.

If you don't mind giving it a kick start and suffering a little loss of power, you can just run it on single phase power.

Also, if you can find another three phase motor, you can make yourself a converter. It's not that difficult.

- Jim Katen, Oregon

Link to comment
Share on other sites

  • 7 months later...

Three phase power is more economical for motors than single phase. I wish I had it for my A/C. Lots of homes in Albany, Ga have three phase for their A/Cs. Some are in single phase panels with a three phase style breaker which has an input for the third leg and outputs for all three phases. I put a label in these types of panels that this breaker and the main breaker need to be turned off to remove all power from the building.

This is dredging up a ancient thread but what is being described in the above post is called a Delta Breaker & it is now prohibited by NEC section 408.36(E) (2005 edition) it 1st showed up as 384-16(e) in the 1978 NEC.

delta7.jpg

The breaker pictured is a Cutler-Hammer CH360D.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...