How do you decide whether a home needs 200 amps?
Run a load calculation for the home as it will be used, including new loads such as an electric vehicle charger, heat pump or induction range. The optional method in NEC 220.82 turns the connected loads into a demand in amps, as the load calculation guide shows. If the answer is near or over 100 amps, a bigger service makes sense.
Also check the condition of the existing equipment: a damaged meter base, a panel with known problems, or no room for needed circuits can justify the upgrade on their own.
What is in the scope of a service upgrade?
Write the scope as a list so the customer and the inspector see the same job. Typical items are the meter socket, service entrance conductors or overhead mast, the new main panel, the main breaker, branch circuit breakers and reconnection of existing circuits, the grounding electrode system and bonding, and patching.
Conductor size is set by the service rating and the code table your jurisdiction adopts, so confirm sizes against the adopted edition rather than a rule of thumb.
What are the permit, utility and inspection steps?
The order below is common, but your utility and authority having jurisdiction decide the details. Ask both before you quote the schedule.
Typical sequence: pull the permit with the load calculation if required, schedule the utility disconnect, replace the equipment, pass the inspection, then have the utility reconnect and set the meter. Some utilities will not reconnect until inspection passes.
What does a worked estimate look like?
1418 Ridge Rd, 100A to 200A overhead service. These are example costs, so replace them with your own.
Materials: 200A panel $380, meter socket $210, service conductors and mast hardware $520, grounding and bonding parts $140, breakers and fittings $350. Total $1,600.
Labor: 12 hours x $95 loaded cost = $1,140. Permit: $180. Direct cost: $1,600 + $1,140 + $180 = $2,920.
Price at a 35 percent margin: $2,920 / 0.65 = $4,492.31, rounded to $4,492. Gross profit is $4,492 - $2,920 = $1,572, which is 35.0 percent of the price.
Add separate lines for items that vary: trenching or an underground service, relocating the meter, utility fees, drywall or stucco patching, and any code corrections the inspector requires.
How do you write the proposal to avoid disputes?
State who pulls the permit, who schedules the utility, and that the outage window depends on the utility. Say what is not included, such as correcting existing wiring defects found behind the old panel. Offer the customer a priced option for added circuits or a subpanel, since the walls are already open.
Step by step
- Run the load calculation. Use the NEC 220.82 optional method for the home and any planned loads, and keep the worksheet with the job.
- Check the site. Inspect the meter base, mast, service conductors, grounding and panel location, and note any trenching or relocation.
- Confirm permit and utility steps. Ask the local building department and the utility about forms, fees, disconnect scheduling and inspection requirements.
- Build the price. Total materials, labor and permit, divide by (1 - target margin), and add lines for variable items.
- Close out. Pass inspection, confirm the utility reconnect and meter set, and leave the customer a labeled panel directory.
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Sources: EC&M: Dwelling Load Calculations Per the National Electrical Code