Power Load Surveys & Electrical Capacity Assessments

Know How Much Power You Use, and How Much You'll Need

Most businesses only find out how much power they really use when something goes wrong: the main fuse blows, a new machine won’t run, or the agent quotes a supply figure that means nothing to you. A power load survey takes the guesswork out. We connect a power logger at your incoming supply and record exactly what your site draws, minute by minute, over a normal working period.

You get a clear picture of your maximum demand, when it happens and how much headroom is left on your supply, explained in plain English and in the kVA and amp figures that network operators, agents and engineers use.

Recent example: merging two sites into one

A national business was planning to move two operations in the South East into a single new building and needed to know what size supply to look for. We logged both existing sites with our own power loggers, worked out the combined peak demand and gave them a clear minimum supply size to look for, plus the right questions to ask the agent, including checking the DNO agreed capacity as well as the physical supply size, because they aren’t always the same thing.

That meant they could rule unsuitable buildings out early, instead of finding out after signing a lease.

Get a Quote for a Power Load Survey

Tell us about your site and what you’re planning, whether that’s a move, an expansion, new equipment or EV charging, and we’ll recommend the right length of survey and come back with a fixed price.

When Do You Need a Power Load Survey?

A power load survey is worth doing whenever you’re about to make a decision that depends on how much electricity you have to play with:

  • Moving or merging premises: know what size supply to look for before you commit to a lease or purchase.
  • Adding EV chargers: find out how many charge points your existing supply can support, and whether load management or an upgrade is needed.
  • New machinery, air conditioning or heat pumps: check there’s genuine headroom before you buy, not after it’s installed.
  • Nuisance tripping or blown fuses: see what’s actually happening on each phase, and when.
  • Before a supply upgrade: make sure you ask the DNO for the right capacity, not too much or too little.
  • Server and comms rooms: understand how close you are to the limits of your supply and UPS.

What's Included in a Power Load Survey

Every survey is carried out by our own engineers using our own power loggers, so there’s no waiting around for hire kit. We’ll recommend how long to log for, usually 7 to 14 days, so we capture a realistic working pattern rather than a one-off snapshot.

Useful guides:

Logging at Your Incoming Supply

We safely connect a three-phase power logger at the main incomer, recording current, voltage, kW, kVA and power factor on every phase, with minimal disruption to your site.

A Clear, Plain-English Report

Peak demand, when it happens, phase balance and remaining headroom, with charts and the figures translated into what they mean for your building and your plans.

Recommendations You Can Act On

Whether your supply can take what you're planning, what size supply to look for, and what to ask your DNO, landlord or agent.

Why Choose Martin Cook Electrical?

Our Own Engineers and Kit

Surveys are carried out by our own qualified engineers with our own power loggers, so we can start quickly and stand behind every figure in the report.

Plain English, Not Jargon

We explain what kVA, amps and maximum demand mean for your building and your plans, so you can make the decision with confidence.

Since 1998

NICEIC approved electrical contractors working across Bedfordshire, Buckinghamshire, Hertfordshire and London for over 25 years.

Talk to Us About Your Power Requirements

Moving, expanding or adding new equipment? A power load survey now can save you an expensive surprise later. Tell us what you’re planning and we’ll come back with a plan and a fixed price.