Dry type transformer, terminations

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benaround

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This is a 750kva dry transformer 480/208Y120 , it's inbetween the HI/LOW

sides of the SES outside, and very little side clearance. While looking at the

cut sheets today I notice the lugs for the primary side are about 5" from the

back cover. The secondary side lugs are about 11" from the front cover.

Q. Has anyone ever connected a tranny and had to use the front and back

to terminate it?? The problem being 48" clearance behind it. It's a C-H transf.
 
benaround said:
This is a 750kva dry transformer 480/208Y120 , it's inbetween the HI/LOW

sides of the SES outside, and very little side clearance. While looking at the

cut sheets today I notice the lugs for the primary side are about 5" from the

back cover. The secondary side lugs are about 11" from the front cover.

Q. Has anyone ever connected a tranny and had to use the front and back

to terminate it?? The problem being 48" clearance behind it. It's a C-H transf.
Click to expand...
Can't say I've terminated such a xfmr, but I have done terminations in the back of switch gear with less working clearance than 48". It was a power plant 480V installation with about 30" clearance. I don't see what you seem to be concerned with at 48".

Additionally, the xfmr top and sides can usually be removed, for that little bit extra clearance, to ease the installation process.
 
Smart,

Here's the picture, SES ,outside, 5 sections 36" deep located 20" off the

tilt up wall, after the 5th section and from the 5th section the transformer

gets it's feed, after the transformer sections 6 and 7 stand and the get fed

from the transformer. To make it interesting Iv'e got 6" on each side of the

transformer. OK, I can use wireway for line and load as long as the transformer

stays lined up with the SES, but if it has to move 48" more off the tilt up

wall, I'm going to have a problem. For the sake of arguement, the locations

are fixed.
 
If you remove the front cover and top cover are the primary connections accessible? Are you concerned with a code issue or just wondering how you're going to wire the thing?
 
Trevor,

I'm concerned with working space, if it is deemed that access is needed in

the back. Yes, the top comes off and I can get it done, but this is the same

EI who wanted thumb screws on roof top mushroom fans.
 
benaround said:
This has 3 sets 500 coming in and 7 sets of 500 going out.
Click to expand...
Sidenote: Now, if that doesn't point out one of the advantage of using higher voltages where you can, I don't know what would.
 
benaround said:
Trevor,

I'm concerned with working space, if it is deemed that access is needed in

the back. Yes, the top comes off and I can get it done, but this is the same

EI who wanted thumb screws on roof top mushroom fans.
Click to expand...
...5 sections 36" deep located 20" off the tilt up wall...
Click to expand...
Does the gear require backside terminations? If so, don't you have to have 3' 6" working space (NEC) on the backside of the gear? I didn't question the xfmr since you said it is going to be 4' off the wall.

How do you plan to route the feeders? Is the gear and xfmr open bottom? ...where you'd be able to run underfloor raceway(s)?
 
dcspector said:
good point Larry.
Click to expand...
Thanx, and I didn't mean to sound like a great revelation was made; it's something we already know well. I imagine some readers might have thought "Duh!" to themselves.

It's just that we don't often see the same size conductors on both sides of the transformer, where the conductor quantity is the only difference, and it's easier to visualize.
 
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