Electrical Panel Installation: How It Works, Step by Step
An electrical panel installation is the job that everything else in the house depends on. Done properly it is invisible for thirty years. Done badly it is a fire risk that passes inspection anyway. Here is what actually happens, step by step, so you know what you are buying.
This is the process. If what you want is the price of a panel upgrade in New Jersey, we wrote that up separately.
What a panel installation actually involves
People use “panel installation,” “service upgrade,” “breaker box replacement” and “panel upgrade” to mean slightly different jobs. The distinction matters because it changes the price and the permit:
- Panel replacement — the existing service size stays the same (say 200 amps in, 200 amps out) and only the panel itself is swapped. Common when a Federal Pacific or Zinsco panel is being retired
- Service upgrade — the amps increases, typically 100 to 200 amps. This also means a new meter can, new main power wires, and coordination with the utility
- Sub-panel installation — a second, smaller panel fed from the main, for an addition, a garage, a finished basement or a workshop
The steps, in order
- Load calculation. Before anything is quoted, the existing and future load is calculated to the National Electrical Code. This is what determines whether you need 100, 150, 200 or 400 amps. Anyone quoting a panel without doing this is guessing.
- Permit application. The work is filed with your township construction office. We submit the application; the township bills its fee directly to you, because every town charges differently and we are not marking it up.
- Utility coordination. If the main power feed or meter is being replaced, the utility — JCP&L across most of Central New Jersey, PSE&G in East Brunswick, Bridgewater and a few others — has to disconnect and later reconnect. That gets scheduled, not improvised.
- Power down and demolition. The service is cut, the old panel opened, and every circuit identified and labelled before anything is disconnected. This is the step that separates a tidy job from a nightmare a year later.
- New panel set and bonded. The new enclosure is mounted, the main power wires landed, and the grounding electrode system connected — ground rods and the water pipe bond. Neutral wires and grounds are separated correctly, which in a main panel means bonded, and in a sub-panel means isolated.
- Circuits transferred and breakers sized. Every circuit is moved onto a breaker sized to its wire, not to whatever was there before. Arc-fault and ground-fault protection is added where the code now requires it — which is far more places than when most older panels were installed.
- Labeling. A legible, accurate directory. It costs us fifteen minutes and saves you an emergency call.
- Power restored and tested. Every circuit energised and verified, GFCI and AFCI devices tested, voltage and grounding confirmed.
- Township inspection. The inspector signs off. We encourage this on any major work — it is proof the job was done to code. Be cautious of any contractor who would rather not pull the permit.
How long it takes
A straight panel replacement is usually a single day, with the power off for most of it. A full service upgrade with a new meter and main power feed often runs one to two days and depends on when the utility can get there. Anyone promising a two-hour panel swap is skipping something.
The things that go wrong
Double-tapped breakers
Two wires under one breaker terminal that was listed for one. Extremely common in panels that ran out of space years ago, and a classic home-inspection flag.
Neutral wires and grounds bonded in a sub-panel
In a sub-panel the neutral wire bar must be isolated from the enclosure. Grounding them there puts current on the grounding system. It is one of the most frequent mistakes we find in work done by handymen.
Undersized main power wires
A new 200-amp panel fed by wires sized for 100 amps is a panel that looks new and is not. The label on the door means nothing if the wire feeding it cannot carry the load.
The two panel brands to know about
Federal Pacific Stab-Lok and Zinsco panels have a documented history of breakers that fail to trip under fault conditions. If you have one, that is the reason to replace it — not the age of the panel. We will tell you plainly which one you have.
Can you install a panel yourself?
No, and this is one of the few places we will be blunt. Panel work happens upstream of the main breaker, where wires stay live after the main is off. It requires a permit, an inspection, and in New Jersey a licensed electrical contractor. Homeowner panel work is where electricians get called to fix something that is already smoking.
Common questions
How long does an electrical panel installation take?
A straight panel replacement is typically one day with the power off for most of it. A full service upgrade involving a new meter and main power feed usually takes one to two days and depends on utility scheduling.
Do I need a permit to install an electrical panel?
Yes. Panel and service work requires a permit and a township inspection in New Jersey. We file the application; the township bills its fee directly to you.
Will my power be off during the installation?
Yes, for most of the working day. If the main power feed or meter is being replaced, the utility has to disconnect and reconnect, which we schedule in advance.
Do I need 200 amps?
It depends on a load calculation, not on a rule of thumb. Central air, an EV charger, electric range, electric dryer or a heat pump all push the number up. We calculate before quoting.
Should I replace a Federal Pacific or Zinsco panel?
Both have a documented history of breakers failing to trip under fault. If you have one, replacement is a safety decision rather than a maintenance one.
Can a handyman install a panel?
No. In New Jersey this is licensed electrical contractor work, it requires a permit, and it is inspected. It is also live-wire work upstream of the main breaker.
Talk to an electrician who does this weekly
We handle panel replacements, service upgrades and sub-panels across Monmouth, Middlesex, Somerset, Union and into Morris, from offices in Hazlet and Bridgewater. Both open 24 hours. Read more about our panel upgrade service, or call and describe what your panel is doing.
Frequently asked questions
How long does an electrical panel installation take?
Most panel replacements are a single day, occasionally two if the service entrance or meter can also has to be replaced. Your power is off for part of that day. The coordination with PSE&G or JCP&L to disconnect and reconnect the service is usually what sets the date rather than the electrical work itself.
How much does a new electrical panel cost in NJ?
Most panel installations land between $2,000 and $7,000. The spread depends on the amperage, whether the meter can and service entrance cable need replacing, your township’s permit fees, and anything the inspector requires once the cover is off. You get a written number before work starts.
Can I install an electrical panel myself?
No. In New Jersey this is licensed work, it requires a permit and inspection, and it involves the service conductors, which stay live even when your main breaker is off. Beyond the legal problem, an unpermitted panel is something that surfaces at resale and during insurance underwriting. This is the job to hire out.
Do I need to upgrade from 100 amp to 200 amp service?
Only if the load calculation says so. Plenty of 100 amp services are perfectly adequate for the house they serve. The upgrade becomes necessary when you add large loads: an EV charger, a heat pump, an electric range replacing gas, or a hot tub. We run the calculation rather than guessing, because a service upgrade you did not need is expensive.
What goes wrong during a panel installation?
The usual surprises are all found once the cover is off: undersized or corroded service entrance cable, a grounding electrode system that was never brought up to current requirements, neutrals shared between circuits, and cloth-insulated wire that crumbles at the terminations. None is unusual in older New Jersey housing, and all of them are cheaper to correct while the panel is already open.
Do I need a permit to replace an electrical panel?
Yes, always, filed with your township construction office and inspected on completion. We file it, coordinate the utility disconnect and reconnect, meet the inspector and hand you the signed approval. Unpermitted panel work is one of the most common things flagged during attorney review at closing.