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Load Study / Demand Analysis Report

A Load Study / Demand Analysis Report calculates the electrical demand of a building or service to confirm the supply and feeders are adequately sized. It supports service upgrades, added loads such as EV chargers or heat pumps, and permit applications.

NEC Article 220 (Branch-Circuit, Feeder, and Service Load Calculations), standard and optional calculation methodsValid: One-off (no expiry)

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Sample Load Study certificate

Sample Load Study / Demand Analysis Report certificate created with CertBox, showing the professional PDF layout with connected and demand loads by category, calculation method (standard or optional), existing service and feeder capacity

Sample Load Study with fictional data. All personal details shown are fake.

What it covers

  • Connected and demand loads by category
  • Calculation method (standard or optional)
  • Existing service and feeder capacity
  • Spare capacity for new loads
  • Recommended service or feeder size

Who needs a Load Study?

Electrical design professionals
Contractors sizing a service upgrade
Facility managers adding load
Solar and EV installers

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Frequently asked questions about Load Study

When do I need a load calculation?
A load calculation is typically required when upgrading a service, adding significant load such as an EV charger, heat pump or hot tub, or when a permit application asks you to demonstrate the service has spare capacity.
What is the difference between the standard and optional method?
NEC 220 Part III sets out the standard method, applying demand factors category by category. The optional method (NEC 220.82 for dwellings) uses a simplified percentage-based calculation. Both are valid; the optional method often yields a smaller result for homes.

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