4 Socket Electric Meter Base Replacement

Details and Photos About The Replacement of a 4 Gang Electric Meter Socket Base

Dear Mr. Electrician: How does a four socket electric meter base stack get replaced?  I live in a condominium community.  While walking my dog I took notice of my 4 socket electric meter base on the side of the building.  It has a lot of rust and looks very old.  Is this something that I should contact my property association about?

Answer: Yes absolutely contact your association or property manager to have this looked at.  The problems that you see on the outside may indicate more severe issues inside of the electric meter base.  Below are pictures of a 4 socket electric meter base that I was called to look at and then replace.  NOTE: Text links below go to applicable products on Amazon.com

An old four gang electric meter base
An old four gang electric meter base.

In the photo above, the bottom of the main cover has holes from rust.

Labor to Replace a 4 Socket Electric Meter

I installed a Siemens 5 gang meter socket to replace the rusted four gang, single phase, electric meter socket base on a residential condominium building.  The electrical service was 120/240 volts, with a four hundred amp underground feeder.  The new four gang meter sockets are a vertical stack and would not line up with the existing feed cables so I used a five gang meter base instead.

For the entire job I figured about 40 man hours of labor which included driving two new ground rods with a new grounding electrode conductor and intersystem bonding termination, permit application, electrical inspection, call for a property markdown, arrangements with the power company to have meter locks removed ahead of time and to disconnect power when needed, pre-cutting and painting of the new meter base back board, advance notification to all of the dwelling unit occupants about the power outage due to work being done, labeling of existing tenant load wires, removal and disposal of the old multi-gang meter socket, and installation of the new multi-gang meter socket.

  Amazon Sells Multi-Socket Electric Meter Bases

When I submit my permit application I include a short one page typed “Scope of Work” statement briefly explaining what work will be done.  This gives the electrical inspector a better idea before hand of what is going on.  If something is not right it is better to find out before work commences.

The actual time spent just removing the old meter base and installing the new Siemens 5 gang meter socket base was approximately 3 hours using three experienced electricians.

View of the circuit breakers inside of an old rusted four gang meter base
View of the circuit breakers inside of the old rusted four gang meter base.

The above circuits were live and in use at the time of this photograph.

View of the inside of the circuit breaker enclosure on a rusty 4 gang electric meter base
View of the inside of the circuit breaker enclosure on a rusty 4 gang electric meter base live and in use.

The tenant load wires which provided power to the condos were in good working condition.

Tenant load wires entering the rear of the rusty four gang meter base
Tenant load wires entering the rear of the rusty four gang meter base.

The original installer used a 2″ squeeze connector installed backwards without a clamp to protect the wires from the sharp metal edge of the knockout.  In the new installation I used 1 1/4″ chase nipples with locknuts and plastic bushings for each tenant load cable.  The 1 1/4″ holes were made using a knockout punch as the factory installed concentric knockouts did not align with the existing wires.

The culprit that causes the rust and the aging meter socket to pull away from the building is water.  I have found on a few of these meter bases that the top hub cover was not installed properly and was not caulked.  This allowed water to leak in.  Some other meter bases were only mounted to the side of the building using drywall screws which rusted from moisture in the air.  Other times water was getting behind the meter socket and caused the back side to rust as well as the wood underlayment to rot.

View of the top of the rusty four gang meter base
View of the top of the rusty four gang meter base.

This particular meter base was originally installed using drywall screws.  They rusted and as the wood siding became soft from water the screws pulled out.  This led to water getting onto the back of the meter base.  There does not appear to be any evidence of caulking along the top from the original installation.

Side view of the 4 gang rusty electric meter base as it is falling away from the building
Side view of the 4 gang rusty electric meter base as it is falling away from the building.

You can see the remains of caulk that had been applied many years ago.  If new mounting screws were installed a few years before and new caulk applied to the top, this meter socket base would not have to be replaced.

The old rusty 4 gang electric meter base is removed and a moldy rotting backboard is exposed
The rusty 4 gang electric meter base is removed and a moldy rotting sheathing is exposed.

With the wood underlayment rotten from water it was necessary to install a new backboard that was screwed directly onto the wood studs.  On one or two occasions I found that part of a wood stud was rotted away as well.  In those instances I had to install a 2″ x 4″ against the side of the existing wall stud and screw it in place high and low where there still was good wood.

Moldy and rotting sheathing where the old meter base was mounted
Moldy and rotting sheathing where the old meter base was mounted.

In the picture above you can see how water settled at the lower section of the wood underlayment.  Notice at the top just to the right of center you can see the old grounding electrode conductor through the hole in the underlayment.  This grounding electrode conductor was used to bond the interior metal water piping.  The water service pipe to the building was non-metallic.  The single ground rod was the only earth ground.

You can see on the left the electrical permit inside of a plastic bag taped to the side of the building.

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