Educational & Classroom Lab Equipment worked example

Safety Test Load Cost with safety test connected load of 6 kW: a worked example

This worked example runs the safety test load cost numbers for a tougher week than the baseline: safety test connected load of 6 kW instead of the typical 12 kW. Estimate energy cost for powered safety testing of fume hoods, electrical trainers, lab carts, emergency stations, demonstration equipment, or powered classroom lab products.

The inputs for this scenario

  • Safety test connected load: 6 kW (the input this scenario stresses; the baseline uses 12)
  • Safety test runtime: 8 hr (held at the documented default)
  • Blended electricity rate: 0.12 $ / kWh (held at the documented default)
  • Lab equipment units safety-tested: 1,000 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Safety test energy cost = safety test connected load × safety test runtime × blended electricity rate.
  • Safety test energy cost works out to 5.76 $ at these inputs, and this is the headline figure for the scenario.
  • Safety test energy used works out to 48 kWh at these inputs.
  • Safety test energy cost per unit works out to 0.01 $ / unit at these inputs.
  • Hourly safety test energy cost works out to 0.72 $ / hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where safety test connected load sits at 12 kW and the headline result is 11.52 $, this scenario comes in 50% below the baseline at 5.76 $.
  • Use it when budgeting a production run of lab equipment, sizing the energy overhead of UL/IEC compliance testing, or comparing the cost of in-house testing versus a third-party lab. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Safety test energy cost: 5.76 $ (headline result)
  • Safety test energy used: 48 kWh
  • Safety test energy cost per unit: 0.01 $ / unit
  • Hourly safety test energy cost: 0.72 $ / hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Safety Test Load Cost calculator, set safety test connected load to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.