AN XFRMER FEEDING TO TENANTS

[Toros]

Hi,
wondering,
If I can feed two separate tenants (to thier in-tenant sub panels loaded 100A max. at 120/208v, 3p)
Through a 75k 480-120/208 step-down transformer.

Another word,
Can the secondary of xfrmer be two feeders suppling two separate tenants????

meetering/ monitoring is not issue!

Tanx

 

[GoldDigger]

Overcurrent protection for the wires might be an issue if the distance from the secondary to the two panels is too great and you do not put in separate protection at the transformer.
PS: the secondary of the transformer cannot *be* a feeder, it can only supply power to a feeder or feeders, which may be taps on the secondary.

 

[iwire]

Can the secondary of xfrmer be two feeders suppling two separate tenants????

Yes, but you will need overcurrent protection for both within 10' of conductor length and you will need to run a set of conductors from each overcurrent device all the way to XO, X1, X2 etc.

 

[GoldDigger]

If you put in a single OCPD near the transformer and then split the output of that OCPD, would that not avoid "tapping a tap"?

 

[iwire]

If you put in a single OCPD near the transformer and then split the output of that OCPD, would that not avoid "tapping a tap"?

Sure but that would require each feeder to be larger than needed.

Say you are trying to send 100 amps to each panel, that single OCPD will have to be a 200 and the conductors to the panels as well.

 

[GoldDigger]

If the first tap (connection to the secondary) is considered to end at the OCPD, could you not then reduce the size, starting two new taps at that point?

 

[iwire]

If the first tap (connection to the secondary) is considered to end at the OCPD, could you not then reduce the size, starting two new taps at that point?

Sure if both panels have main breakers and are within the tap length limits. That may be the case but I was picturing the panels being in each tenant space.

But if they are that close it might be cheaper to just leave the transformer twice and go right to each panel.

 

[kwired]

If the taps are outside they can be unlimited in length.

 

[iwire]

If the taps are outside they can be unlimited in length.

And if there are in the arctic they can be smaller.