Does Your Building Have Enough Power? A Facility Manager’s Guide to Electrical Capacity

New equipment, a new tenant, EV charging for a fleet, a server room or a production line expansion all draw more power. If a building’s electrical service can’t carry it, the project stalls, or worse, it goes in anyway and the building runs with breakers tripping, conductors running hot and no room to grow.

This guide is for facility managers, property owners and business owners in Central and Southside Virginia who need to know how much capacity they have before they commit.

Signs a Building Is Near Its Limit

• Breakers or fuses trip when equipment runs at the same time
• Panels are full, with no spaces for new circuits
• Lights dim or equipment stutters when large motors start
• Switchgear, panels or transformers run hot, or show discoloration on thermal scans
• The utility has mentioned demand charges or a service at its limit
• You’re planning new equipment, a tenant fit-out, EV charging or an addition

Measure, Don’t Guess

A nameplate on the service tells you its rating, not how much of it you use. The National Electrical Code allows existing load to be determined from actual measured demand. There are two good sources:

• Utility demand data: twelve months of peak demand from your bills or your utility (Appalachian Power, Dominion Energy or an electric cooperative).
• Load monitoring: recording meters on the service or feeders for a period that captures typical peaks.

From there, a load analysis adds the new equipment, applies the right demand factors and shows the headroom that’s left, on the service and on each panel and feeder that will serve the new load.

Options When You Need More Capacity

A full service upgrade isn’t always the answer. Depending on what the analysis shows:

• Rebalancing loads across phases and panels
• A new subpanel or feeder from a service that has headroom
• Load management, such as EV chargers that share capacity or controls that keep large loads from running together
• Power factor or power quality improvements for motor-heavy facilities
• A service upgrade, with new switchgear and utility coordination, when the building truly needs more

Plan Before You Sign

The best time to check capacity is before you buy equipment or sign a lease. A service upgrade can involve the utility’s own engineering and equipment lead times, and switchgear can take months to arrive. Knowing early protects your schedule and your budget.

Related Requirements

• New and modified equipment may need updated arc-flash labels.
• Larger loads raise the stakes on maintenance; see NFPA 70B preventive maintenance.
• For equipment hookups, see powering new equipment.

Planning an expansion or new equipment? Book a visit on our booking page and we’ll measure what you have before recommending what you need.

Frequently Asked Questions

How do I know how much electrical capacity my building has?

Start with the service rating, then measure actual demand from twelve months of utility data or from load monitoring. A load analysis compares that with what you plan to add.

Can I add equipment without a service upgrade?

Often, if the measured demand leaves headroom and the panels and feeders serving the area can carry it. Load management can also help.

How long does a commercial service upgrade take?

It depends on utility engineering and equipment lead times, which can be months for switchgear and transformers. Starting early matters more than the installation itself.

What is a load study?

A load study records actual electrical demand over time, so decisions about new equipment are based on measured data rather than nameplate estimates.

Why Facility Managers Call Progress and Heritage

We measure, analyze and design capacity upgrades for commercial and industrial buildings, then build them with minimal disruption. Our licensed, insured, background-checked electricians serve Lynchburg, Roanoke, Danville, Martinsville and the surrounding counties. See our construction and facility upgrades.