ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
GFCI's pops in large numbers
by dsk - 10/21/21 02:03 AM
Need some info on Japanese outlets, 200V 15A
by andey - 10/20/21 08:05 AM
Wire sizing
by watersparkfalls - 10/19/21 07:27 AM
nec 110.3 (B)
by watersparkfalls - 10/19/21 07:09 AM
A 5-20(20a) receptacle is legal on a 15a circuit?
by libellis - 10/10/21 12:46 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
1 members (Scott35), 16 guests, and 18 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Nov 2002
Posts: 267
W
Member
How many of you are now installing 400 amp residential services and what do you use for a panel and meter?
~Andy

Joined: Apr 2002
Posts: 914
E
Member
Most of our work is with 400 amp services. You use 2 - 200 amp panels and either a meter disco combo with 2 -200 mains in it or we build a service using a 320A meter base and 2 - 200 amp disco's. It depends on whether the poco in the area will give us the meter base for free or if we have to buy it from them. If they charge, we just put that money (usually about $180) towards the cost of the combo unit and save the labor time.

Joined: Dec 2001
Posts: 444
S
Member
Just installed one the other day! One of our projects is an upper end survey of fine million dollar plus homes and half will have the 400A service. The Hydro company wants us to use an outdoor meter with built in CTs (Microlectric brand), from there we bring the service to the main switch and add a splitter. We normally put a 200A panel near the main service, and add 100A subpanels as needed off the splitter throughout the residence (usually top floor, kitchen, and near the backyard for the pool equip, hot tub, etc.)

Joined: Nov 2002
Posts: 267
W
Member
That's is pretty much how I was doing it until lately. I found a Murray panel that has a double main break in it. A 400 amp bus which the line lugs goes directly to a factory installed 200 amp breaker with provisions on the line bus for a second 200 amp breaker. So in essense you have up to 70 circuits on one 400 amp service because you can add a 40 ckt MLO. Also your allowed an additional 125 amp breaker in this 400 amp panel for an additional MLO. This is allowed with the use of a regular 400 amp 4 jaw meter socket. Milbank makes the U2448-x model socket. In the long run you save quite a bit as long as it's allowed in you areas.

~Andy


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 811
Joined: April 2004
Top Posters(30 Days)
dsk 6
Popular Topics(Views)
284,723 Are you busy
217,349 Re: Forum
203,700 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5