Hey Guys. So, Im here at Raytheon Again in Los Angeles. They are upgrading a lab and pulling an 800amp feed from a Substation to feed the panels being added. So, my question is about the 800amp feeder/raceway. The in house engineers have called for a 200%neutral and sized the ground at 500MCM as well for a total of (6) 500MCM's in a 4" Rigid. Now, according to the NEC that is fine. You can put (7) 500MCM's in a 4"rigid. But it leaves little room and we have one standard (not a big sweep) 90 degree bend. Can I get some thoughts on the difficulty here with such a tight fit. Or, it is what it is and we need to just soap that baby up? Any help would be much appreciated. Tahnk guys.
Well on our project right now I have 200% neutrals all over the building this is our engineers design a 800amp feeder gets 500 MCM phases 500 MCM for neutral x 2 and a 250 mcm ground now if we have 200% neutral with a isolated ground then its two grds We have no trouble pulling this in a 4 inch conduit we bend our EMT but why 6x500 MCM that's over kill .Is it a long one voltage drop ?
We been pulling 6 or 7 wires in for 4 months lots of fun why the big ground must be long how long.
And we don't use soap simpull wire
TYPICAL RUNS 800 amp 4 runs 500mcm ph 500mcm x 2 neutral 200 % a 250 mcm ground 4 inch conduit
1200amp 4 runs 500mcm ph 500 mcm neutrals 250 mcm ground 4 inch conduit
600amp 2 runs 500 mcm 500 mcm neutrals 2/0 ground 4 inch conduit
2000 amp 6 runs 4 inch 600 mcm phases 600 mcm neutral x2 500 mcm ground x2 if isolated ground this is all alu wire simpull 3 men feed one man tugs we use a Greenlee UT10 tugger wire feeder Greenlee even with out the wire feeder we use 3 men feedering we get our wire on one spool by south wire all phases neutral and ground one spool.
The tugger maxed out at 2000 lbs to 4000lbs at times but slides right in and we are pulling most of the time via two pull boxes straight with 6x90 degree bends total bends . Simpull wire that is the best wire today you can not damage it with no soap used . That's a 500 kva 6 runs in the photo we have 12 of these on site with 200 % neutrals and isolated grounds 7 wires .