How many KV?

Status
Not open for further replies.
R

rattus

Senior Member
Just so I am not so ignorant, what is the range of primary voltages in a residential distribution system?
 
It will vary depending upon your area and the POCO's own preferences.

Here is So Cal, we have 4.16kv wye, 12kv delta, 16 kv delta, 34.5 kv delta (mainly light commercial/industrial).

You can call your local POCO and inquire about what distribution voltages are used in your area, or if you happen to see a crew working in the field ask them.

One clue for if a service is delta: If the the transformer has two fuse cutouts on the primary, it's delta. Wye will have one cutout as the other side of the primary is usually connected to system neutral.

My own neighborhood is a mix: east/west streets are served as 4.16 wye, and the north/south streets are 16kv delta.
 
I have two commercial clients that have residential neighbors. One system is fed by 13.2, and the other by 13.8.
 
kwired said:
isnt 2.4k the line to neutral voltage of 4.16k wye system?

on this system most single phase transformers will connect line to neutral.
Click to expand...
2.4 kV is also the line-to-neutral voltage on a 4.16 kV system. I was giving the line-to-line voltages.
 
Here in the UK, 11KV is very widely used, there is some 3.3KV and some 6.6KV but not much.
Unlike USA practice, 11KV is almost allways 3 phase, 3 wire without neutral, some rural lines being 1 phase 2 wire, again without neutral.
 
My area 24KV new contruction and 13.8KV older areas. Autotransformers are used to tie the networks together
 
Last edited:
In the Bay Area the most common is 12000 Delta. Older systems are 4160 wye and the newer systems are 21000/12470 wye. The pad mount transformers PG&E uses have a switch to select 12kv or 21kv primary so the same transformers can be used on both systems.
 
broadgage said:
Here in the UK, 11KV is very widely used, there is some 3.3KV and some 6.6KV but not much.
Unlike USA practice, 11KV is almost allways 3 phase, 3 wire without neutral, some rural lines being 1 phase 2 wire, again without neutral.
Click to expand...
Your practice is better, the use of a primary grounded conductor is one of the major sources of stray voltage in the earth here in the US.
 
Status
Not open for further replies.
Top