High rising buildings

[m sleem]

For building up to 68 floors, can we have 13.8kv/480v transformers inside? if not recommended, can we step down the 13.8kv to 4.16kv and then distribute the 4.16kv/480v transformers inside the building?

Also, any feedback for w/m2 for such buildings if it's for residential use?

 

[infinity]

On our last apartment complex we had 4-4000 amp 208Y/120 volt services stepped up to 4160 and then used 4160-208Y/120 volt substations for apartment power as we went up the towers.

 

[Hv&Lv]

On our last apartment complex we had 4-4000 amp 208Y/120 volt services stepped up to 4160 and then used 4160-208Y/120 volt substations for apartment power as we went up the towers.

This may be a dumb question, but do you run into many oil filled transformers in the old high rises anymore?

 

[electrofelon]

On our last apartment complex we had 4-4000 amp 208Y/120 volt services stepped up to 4160 and then used 4160-208Y/120 volt substations for apartment power as we went up the towers.

Taking service at MV and distributing the MV directly was not an option?

 

[Todd0x1]

Taking service at MV and distributing the MV directly was not an option?

That sounds like one of those con-ed 500ka fault current network distribution schemes thats 208Y120 to the curb no matter the building. "Here's the voltage we'll give you, if you need something else start your own dang utility"

 

[don_resqcapt19]

In Chicago, the utility owns the medium voltage distribution in the high rises. I believe it is all 13.8 kV, but not sure.

 

[electrofelon]

That sounds like one of those con-ed 500ka fault current network distribution schemes thats 208Y120 to the curb no matter the building. "Here's the voltage we'll give you, if you need something else start your own dang utility"

That's odd, you would think it would be better for everyone to have a primary service instead of that 16,000A 120/208 nonsense

 

[infinity]

That sounds like one of those con-ed 500ka fault current network distribution schemes thats 208Y120 to the curb no matter the building. "Here's the voltage we'll give you, if you need something else start your own dang utility"

Yes it was ConEd but they had (4)-13.8-208Y/120 transformers at the curb line. My guess is that the 208 volt services were by the design of the building engineer, maybe they didn't want a network protection compartment. Not only did we have many 208-4160 transformers we also had several 208-480 transformers as well.

 

[Todd0x1]

Yes it was ConEd but they had (4)-13.8-208Y/120 transformers at the curb line. My guess is that the 208 volt services were by the design of the building engineer, maybe they didn't want a network protection compartment. Not only did we have many 208-4160 transformers we also had several 208-480 transformers as well.

Were those transformers dedicated for this building, or were they network transformers? Seems odd to not just omit those transformers and bring the 13.8 into and up the building.

 

[ron]

I just installed (2) 15kV class primary (specifically 13.2kV) 480V secondary FR3 (liquid filled) transformers on the 5th Fl of a 32 story building. No problem. Nothing in the NEC or building code to prohibit it.

 

[electrofelon]

I just installed (2) 15kV class primary (specifically 13.2kV) 480V secondary FR3 (liquid filled) transformers on the 5th Fl of a 32 story building. No problem. Nothing in the NEC or building code to prohibit it.

There are some restrictions for dwelling units voltage. 210 has restrictions on branch circuit voltages, and 690 limits PV systems to 600 or less and storage batteries to 50 or less, but other than that, I am not aware of any voltage or transformer restrictions for non dwellings, do whatever you want!

 

[infinity]

Were those transformers dedicated for this building, or were they network transformers? Seems odd to not just omit those transformers and bring the 13.8 into and up the building.

Dedicated to the building. Building fed with 208Y/120.

 

[m sleem]

This may be a dumb question, but do you run into many oil filled transformers in the old high rises anymore?

No, but it could be 13.8kv dry type transformers

 

[m sleem]

I just installed (2) 15kV class primary (specifically 13.2kV) 480V secondary FR3 (liquid filled) transformers on the 5th Fl of a 32 story building. No problem. Nothing in the NEC or building code to prohibit it.

That's good, but any feedback for watt/ft^2 for such buildings if it's for residential use?

 

[GeorgeB]

Also, any feedback for w/m2 for such buildings if it's for residential use?

It's going to heavily depend on environmental air, clothes drying, water heating, and cooking