Landing On Disconnect

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Alwayslearningelec

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Question about landing 4 sets of 2-/12" on 800A disconnect switch.

1. Have 4 sets of 2-1/2" with #250 and have 4 sets #250 MC cable leaving..due to voltage drop. All these would never be able to land on the actual equipment, correct? You would need a trough of some sort?
2. In this case you have 4 wires for each phase. Wouldn't the disconnect only have 3-4 lugs? Would you land multiple wires(same phase) under a single lug? How would the wires terminate?

Thank you
 
If the conductor and terminal quantities and/or sizes don't match, you can use Polaris-type splicers.

For example, use a seven-port block to join four conductors to three terminals.
 
horsegoer said:
Question about landing 4 sets of 2-/12" on 800A disconnect switch.

1. Have 4 sets of 2-1/2" with #250 and have 4 sets #250 MC cable leaving..due to voltage drop. All these would never be able to land on the actual equipment, correct? You would need a trough of some sort?
2. In this case you have 4 wires for each phase. Wouldn't the disconnect only have 3-4 lugs? Would you land multiple wires(same phase) under a single lug? How would the wires terminate?

Thank you
Click to expand...
I would specify Polaris connectors to convert to conductors that would match the lugs.

Whether the transition could be done in the equipment's enclosure or would need to be in a separate enclosure would depend on the amount of space in the equipment's enclosure.

It is a code violation to install two conductors in the same hole of a lug unless the lug is listed for more than one conductor.
 
hmspe said:
I would specify Polaris connectors to convert to conductors that would match the lugs.

Whether the transition could be done in the equipment's enclosure or would need to be in a separate enclosure would depend on the amount of space in the equipment's enclosure.

It is a code violation to install two conductors in the same hole of a lug unless the lug is listed for more than one conductor.
Click to expand...
Thanks. So essentially the multiple conductors per phase would have to be reduced to one via a tap type of block you mention or something from Ilsco?
 
horsegoer said:
Thanks. So essentially the multiple conductors per phase would have to be reduced to one via a tap type of block you mention or something from Ilsco?
Click to expand...
You would need to look at the lugs on the equipment and at the rating of the equipment to know what size the conductors would need to be and how many conductors you would need.

I would expect an 800 amp disconnect to have lugs with three barrels so I would expect changing 4 wires to three wires would be required, but not all 800 amp equipment has three barrel lugs. You have to match thw actual equipment, and the conductor sets connecting to the equipment have to have a suitable amps rating for the amps rating of the equipment.
 
horsegoer said:
Thanks. So essentially the multiple conductors per phase would have to be reduced to one via a tap type of block you mention or something from Ilsco?
Click to expand...
If the equipment doesn't have 4 port lugs, I would change the lugs out to 4 port.

Ilsco PB4-750 Aluminum Panelboard Lug, Dual Rated, Conductor Range 750-1/0, 4 Ports, 2 Holes, 3/8in Bolt Size, 1-3/8in Hole Spacing, Tin Plated, UL, CSA | Capital Electric Supply

ILSCO Panelboard Lug, Mechanical connection, Dual Rated, Aluminum material, Tin plated connector,2 mounting hole(s), mounting bolt/stud size 3/8 in, mounting hole spacing 1.38 in., UL 486A/B Listed, C22.2 No. 65-03, Copper/Aluminum Primary Conductor 750 kcmil - 1/0 Str, 4 conductors, 4...
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I'm a little unlcear, sorry.
So if I have 4 sets of #250( let's just talk phase conductors) that means I have 4 conductors per phase and a total of 12 conductors.

The equipment could possible come or be ordered with lugs that could accommodate/land all those conductors? Or as electro stated just get lugs to accommodate?

So I could get 3 - 4 barrel/port lugs?
 
horsegoer said:
I'm a little unlcear, sorry.
So if I have 4 sets of #250( let's just talk phase conductors) that means I have 4 conductors per phase and a total of 12 conductors.

The equipment could possible come or be ordered with lugs that could accommodate/land all those conductors? Or as electro stated just get lugs to accommodate?

So I could get 3 - 4 barrel/port lugs?
Click to expand...
Sounds like you have 4 conductors on Line & Load = 6 lugs
 
horsegoer said:
I'm a little unlcear, sorry.
So if I have 4 sets of #250( let's just talk phase conductors) that means I have 4 conductors per phase and a total of 12 conductors.

The equipment could possible come or be ordered with lugs that could accommodate/land all those conductors? Or as electro stated just get lugs to accommodate?

So I could get 3 - 4 barrel/port lugs?
Click to expand...
One other potential option is order larger equipment to handle the increased number of conductors, for example in your case a 1000A switch. Of course you would have to weigh increased size and cost of the 1000A switch.
 
electrofelon said:
One other potential option is order larger equipment to handle the increased number of conductors, for example in your case a 1000A switch. Of course you would have to weigh increased size and cost of the 1000A switch.
Click to expand...
Isn't the next size up from 800A a 1200A switch?
 
Often some this larger gear you either specify or order termination method separately. If so make sure to get something that will work with the conductors you plan to use. Some people like to use crimp on lugs and only desire to have studs on the gear to connect those to.
 
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