Xfrmr Lugs?

[infinity]

Forgot to ask, so this mean a lug kit would be required for primary and secondary?

Yes of course. It's unlikely that they would provide only the primary or secondary lugs.

 

[Alwayslearningelec]

Sometimes I see a transition from flex to EMT or RGS. That would require an adapter coupling correct?

 

[augie47]

Sometimes I see a transition from flex to EMT or RGS. That would require an adapter coupling correct?

There are a couple of different ways to accomplish that transition.
Here is a "all in one" fitting for EMT to flex

 

[Alwayslearningelec]

There are a couple of different ways to accomplish that transition.
Here is a "all in one" fitting for EMT to flex
View attachment 2569236

Thanks Augie!!!

 

[infinity]

Sometimes I see a transition from flex to EMT or RGS. That would require an adapter coupling correct?

Yes, and it has a few different names, change over, from to, EMT/Flex coupling, etc. (Photo 1)
In the old days we made them with a rigid coupling and two connectors. (Photo 2)
For multiple raceways we may use a pull box into the side of the transformer. (Photo 3)
In many cases the flex connection is not even needed or required.

 

[Alwayslearningelec]

Yes, and it has a few different names, change over, from to, EMT/Flex coupling, etc. (Photo 1)
In the old days we made them with a rigid coupling and two connectors. (Photo 2)
For multiple raceways we may use a pull box into the side of the transformer. (Photo 3)
In many cases the flex connection is not even needed or required.

View attachment 2569237View attachment 2569238View attachment 2569239

Thanks. Great pics. I thought you always had to have flex into vibrating equipment. At least I believe spec often reads that way.

 

[PCBelarge]

Transformer are not considered as vibrating equipment.

Like the way you transitioned into the transformer. Did you cut the inside for entry, or punch KOs for chase nipples? Just curious, I have done it both ways depending on the size of the conductors.

 

[electrofelon]

Thanks. Great pics. I thought you always had to have flex into vibrating equipment. At least I believe spec often reads that way.

Just about every uses flex into transformers, but I'm not really sure why. I admit I do too just because everyone else does! I honestly don't believed it serves any purpose and code does not require it.

 

[Alwayslearningelec]

Transformer are not considered as vibrating equipment.

Like the way you transitioned into the transformer. Did you cut the inside for entry, or punch KOs for chase nipples? Just curious, I have done it both ways depending on the size of the conductors.

What exactly do you mean? Your referring to the xfrmr enclosure? Curious.

 

[Alwayslearningelec]

Don't you need to ground a xfrmr separately like to building steel etc.?

 

[infinity]

Like the way you transitioned into the transformer. Did you cut the inside for entry, or punch KOs for chase nipples? Just curious, I have done it both ways depending on the size of the conductors.

We cut in windows. Here's a few more photos with the windows. The first is from the transformer in post #25. The second is another transformer.

 

[Alwayslearningelec]

We cut in windows. Here's a few more photos with the windows. The first is from the transformer in post #25. The second is another transformer.

View attachment 2569243
View attachment 2569244

Do xfrms come With concentric ko’s Or you have to cut out ko’s? Also, when do windows need to be cut out as opposed to ko’s? When Using a box?

 

[infinity]

Do xfrms come With concentric ko’s Or you have to cut out ko’s? Also, when do windows need to be cut out as opposed to ko’s? When Using a box?

Some smaller transformers have KO's but for the most part you have to make your own holes or windows.

 

[kwired]

Thanks. Single or double foot???? I've heard of one or two hole lugs..lol

He may be referring to some larger sized ones that might have two "mounting holes" in addition to the conductor port(s).

 

[kwired]

Thanks for all the responses. Does the same apply for disconnect switches?

Over 600 amps you might find they just have studs. Can probably find some that way under 600 amps but probably not with commonly stocked items at most suppliers. Usually 400 and 600 amp items will have a lug that accepts either single or double conductors in the sizes that are most commonly used for that ampacity or even at least accept a size bigger for those cases where minimal upsizing is necessary.

 

[kwired]

Regular disconnects always have the lugs attached. For transformers I guess it depends on the way that they're ordered. I've seen them come with or without mechanical terminals. I've never seen them come with crimp on terminals. If you had a job spec that required crimp terminals it would not make sense to buy transformers that had mechanical terminals that would need to be removed and thrown away. This one (75 KKVA) had the terminals attached from the manufacturer.


View attachment 2569231

Off topic but just noticing the GEC leaving the right side, though nothing wrong with it, probably doesn't require the bonding bushing unless the flex is steel or converts to steel pipe/tubing at some point. Otherwise looks to be zinc die cast fitting and aluminum flex.

 

[infinity]

Off topic but just noticing the GEC leaving the right side, though nothing wrong with it, probably doesn't require the bonding bushing unless the flex is steel or converts to steel pipe/tubing at some point. Otherwise looks to be zinc die cast fitting and aluminum flex.

EMT to steel FMC hence the bonding bushing on the GEC. Another view:

 

[kwired]

EMT to steel FMC hence the bonding bushing on the GEC. Another view:

View attachment 2569267

Image didn't work in the post but shows up when I am composing a reply? But anyway