400 amps underground service 280' from transformer to meter

[tom baker]

IF your calculated load is actually 350 amps (rare on residential), to maintain a 3% voltage drop you would need parallel 300 kcmil AL and, if you don't reduce the neutral, it would take a 3" PVCconduit (assuming there is some Sch 80)

And a 280 ft pull with parallel 300’s would need a tugger, good helpers and spool set up
Does anyone know if the POCO was providing this run, what size they would use?

 

[augie47]

And a 280 ft pull with parallel 300’s would need a tugger, good helpers and spool set up
Does anyone know if the POCO was providing this run, what size they would use?

agree,,, at a true 350 amp load there is a lot involved.
I was not recommending, simply answering the OP's question based on his input.

 

[Hv&Lv]

the other way around for me. The idea of the Poco pulling conductors to the meter socket baffles me, I think I've seen it once in
25 years!

Then this will really blow you away. We dig all the way to the Meterbase, install the conduit, and the conductors.

 

[tom baker]

Then this will really blow you away. We dig all the way to the Meterbase, install the conduit, and the conductors.

Yes. Here we install conduit, pull string from xfrm to meter

 

[Hv&Lv]

Yes. Here we install conduit, pull string from xfrm to meter

Yeah, but I’m the POCO...

 

[electrofelon]

Then this will really blow you away. We dig all the way to the Meterbase, install the conduit, and the conductors.

NO WAY!!!! POCOs here dont want to do anything!

 

[roger]

Then this will really blow you away. We dig all the way to the Meterbase, install the conduit, and the conductors.

When I was working in your area that was normally the case.

 

[Julius Right]

If it is "from the transformer "then according to 450.3 Overcurrent Protection (B) the secondary breaker rating has to be 125% of transformer rating, in my opinion.

 

[hillbilly1]

When I did a job in Tennessee, You put in the conduit, pull string, and the utility would pull the wire ( Volunteer Electric) BREMC, you stub down a pipe and 90, and they dig in and connect to the meter.

 

[nizak]

customer needs at the end around 350 amps

Is this a value you’ve determined with a load calculation or an uninformed homeowner telling you that?

Curious as to the size of the dwelling and what specific equipment ( EV / On demand water/ Back up electric heat strips for GEO, etc.) are being installed.

 

[electrofelon]

If it is "from the transformer "then according to 450.3 Overcurrent Protection (B) the secondary breaker rating has to be 125% of transformer rating, in my opinion.

I assume we're talking about a utility transformer, so that does not apply to a service.

 

[Little Bill]

When I did a job in Tennessee, You put in the conduit, pull string, and the utility would pull the wire ( Volunteer Electric) BREMC, you stub down a pipe and 90, and they dig in and connect to the meter.

That's one of the POCOs I deal with. It's actually VEC." Volunteer Energy Cooperative".

 

[hillbilly1]

That's one of the POCOs I deal with. It's actually VEC." Volunteer Energy Cooperative".

This was many many years ago! LOL!