X-fmer's roughed in the slab - Page 2 - Electrician Talk - Professional Electrical Contractors Forum

EJPHI · 10-04-2009, 07:34 PM

Please unconfuse me

about some of the wiring:

This first pic looks like transformer is wired for 480 delta to 208 wye

In the next one, the connection looks like 480 wye.

It just seems unusual to me that you would have 480 delta and wye in the same installation.

What am I missing?

Thank you
EJPHI

william1978 · 10-04-2009, 08:49 PM

You didn't miss anything. The transformer doesn't need a neutral on the primary side it is recreating the neutral for the secondary side. I'm going to see if I can find a wiring digram.

480sparky · 10-04-2009, 08:54 PM

Quote:

Originally Posted by william1978

You didn't miss anything. The transformer doesn't need a neutral on the primary side it is recreating the neutral for the secondary side. I'm going to see if I can find a wiring digram.

Dis do it?

william1978 · 10-04-2009, 08:57 PM

Quote:

Originally Posted by 480sparky

Dis do it?

That is what I was looking for. Thanks 480.

Decepticon · 10-04-2009, 09:02 PM

Quote:

Originally Posted by 480sparky

When I designed my house, everyone told me I was nuts for not having the garage right off the kitchen. I asked why I needed to do so. Everyone said "So when you replace your refrigerator, it will be easy to get the new one in and the old one out!"

I have yet to replace my fridge, and will probably do so only once in the remainder of my life. I would prefer to have a house designed around the things I do every day, like cook, do laundry, sit at the computer and post on ET...........

That's the reason why I put the garage near the kitchen. We're always taking in groceries and other stuff from the cars, the kitchen is the "headquarters" where everything lands before it is put away.

Decepticon · 10-04-2009, 09:04 PM

Hey William, I guess in your area you won't get gigged for using white instead of gray for the high voltage noodle?

480sparky · 10-04-2009, 09:06 PM

Quote:

Originally Posted by Decepticon

Hey William, I guess in your area you won't get gigged for using white instead of gray for the high voltage noodle?

Got a Code reference?

Besides, the noodle is for the 120/208 side, not the 480 side.

william1978 · 10-04-2009, 09:08 PM

Quote:

Originally Posted by Decepticon

Hey William, I guess in your area you won't get gigged for using white instead of gray for the high voltage noodle?

It is gray tape it does look like white tape in the picture, but even if it was white the inspector couldn't say a thing and it should be that way in your area also.

Decepticon · 10-04-2009, 09:09 PM

Quote:

Originally Posted by 480sparky

Got a Code reference?

There's a lot of things that get gigged that aren't in the code.

Quote:

Besides, the noodle is for the 120/208 side, not the 480 side.

Not in the picture I am looking at.

william1978 · 10-04-2009, 09:10 PM

Quote:

Originally Posted by Decepticon

Hey William, I guess in your area you won't get gigged for using white instead of gray for the high voltage noodle?

Are we talking about the x-fmer or the panelboard?

480sparky · 10-04-2009, 09:10 PM

Quote:

Originally Posted by Decepticon

There's a lot of things that get gigged that aren't in the code.............

Do you ask for a Code reference then?

Quote:

Originally Posted by Decepticon

...........Not in the picture I am looking at.

Uncle! Which one you looking at then?

Decepticon · 10-04-2009, 09:14 PM

Quote:

Originally Posted by william1978

Are we talking about the x-fmer or the panelboard?

I was looking at this picture:

But maybe it's just the coloring on my computer making it look white instead of gray

william1978 · 10-04-2009, 09:18 PM

Quote:

Originally Posted by Decepticon

There's a lot of things that get gigged that aren't in the code.

Not in the picture I am looking at.

Quote:

Originally Posted by Decepticon

I was looking at this picture:

But maybe it's just the coloring on my computer making it look white instead of gray

It does look white in that picture. Check it out in the other pictures. It is gray that is what we use on our 480v.

480sparky · 10-04-2009, 09:19 PM

Quote:

Originally Posted by Decepticon

I was looking at this picture:

But maybe it's just the coloring on my computer making it look white instead of gray

I see it as white, too, but I can see where it is overexposed.

Decepticon · 10-04-2009, 09:21 PM

Quote:

Originally Posted by william1978

It is gray that is what we use on our 480v.

Us too, but I have seen and heard about some pretty wacky color coding around the country, which is why I was curious about yours. I'm glad I could go to NC and know WTF is going on

william1978 · 10-04-2009, 09:30 PM

Quote:

Originally Posted by Decepticon

Us too, but I have seen and heard about some pretty wacky color coding around the country, which is why I was curious about yours. I'm glad I could go to NC and know WTF is going on

Everyone that I know uses gray for highvolt and white for lowvolt. We do have some delta highleg in some of the older area's. So whenever you fell like moving come on over to N.C..

480sparky · 10-04-2009, 09:38 PM

Quote:

Originally Posted by william1978

Everyone that I know uses gray for highvolt and white for lowvolt. We do have some delta highleg in some of the older area's. So whenever you fell like moving come on over to N.C..

Just wait until you find gray that was installed (legally!) as an ungrounded!

william1978 · 10-04-2009, 09:40 PM

Quote:

Originally Posted by 480sparky

Just wait until you find gray that was installed (legally!) as an ungrounded!

Haven't yet, but who know's oneday I just might.

rlc3854 · 10-04-2009, 10:10 PM

Quote:

Originally Posted by william1978

It does look white in that picture. Check it out in the other pictures. It is gray that is what we use on our 480v.

Check out the other three cables in the upper left side. They look gray

micromind · 10-04-2009, 10:12 PM

I've changed out maybe 3 or 4 transformers that were bottom fed so far. The smallest was likely a 15 KVA, the largest was a 300.

It's really not all that hard, just spoon it up onto some blocks, a little on each side at a time. Get it high enough to put some short pieces of 4" or 6" rigid under the end rails, and try to not skin up the wires as it rolls out.

That can be sort of hard if they're 500s. Some transformers you can take the bolts out of the back of the bottom plate, and tip it up a bit. This helps more than you'd think; not only do you have more clearance, but the holes in the bottom plate are now angled slightly to your favor.

If the transformer is on a housekeeping pad, this method becomes much more difficult. It's best to build something up to the height of the pad, so the pipes have something to roll out onto. A couple of 4x8s work pretty good.

Having more than one person helps a bunch. 3 of us did the 300, it went pretty well.

If the transformer isn't too heavy, a cherry picker (the kind used to pull a car engine) is the absolute best possible way, if it'll fit in the room, and straddle the pad.

Rob