Electrical Panels & Service Upgrades

Panel vs. service: two different upgrades

A panel (load center) is the box of breakers. The service is everything upstream: the utility drop or lateral, the meter base, the service-entrance conductors, and the main breaker rating. Swapping a worn-out 200A panel for a new 200A panel is a panel replacement. Going from 100A to 200A is a service upgrade, which also involves the meter base, entrance cable, grounding, and coordination with your utility.

The distinction matters for price and schedule. Panel replacements are usually a one-day job. Service upgrades often need a utility disconnect and reconnect appointment, and sometimes a new meter base or mast, which adds days and cost.

What drives the decision

Electricians size service using a load calculation under NEC Article 220 — either the standard method, the optional dwelling method (220.82), or, for existing homes, a calculation based on 12 months of actual utility demand data (220.87). That math, not a rule of thumb, tells you whether new loads fit.

• Adding an EV charger, heat pump, electric range, hot tub, or induction cooktop
• A fuse box, or a panel brand with a known history of breaker problems
• No open breaker spaces and a panel full of tandem breakers
• Signs of heat damage, corrosion, or water intrusion in the panel
• Insurance or home-sale inspection findings

Smarter alternatives to a full upgrade

A bigger service isn't always the answer. Load-management devices, EV chargers with power sharing, and smart panels can keep new loads within existing capacity by shedding or scheduling them. When a load calculation shows you're close but not over, these options can save thousands. The clusters below walk through each decision in detail.