Take the breaker's size and multiply it by the rated voltage. For example, if you have a 20 amp breaker operating at 120 volts, it will have a maximum load of 2400 watts (20 amps x 120 volts).

To calculate commercial electrical load, you simply need to add together the wattage used when you combine all lighting, appliances, systems, etc. In other words, the wattage used by all commercial electrical loads in your premises.

How do you calculate commercial electrical load? Multiply the volt-ampere unit load (for the type of xx × xx = 5 occupancy) by the square foot outside dimensions. An 8,500-square-foot bank has a general lighting load of 29,750 volt-amperes (8,500 × 3.5 = 29,750).

To calculate commercial electrical load, you simply need to add together the wattage used when you combine all lighting, appliances, systems, etc. In other words, the wattage used by all commercial electrical loads in your premises.

In an office building the lighting and normal "floor" (equipment) electrical loads typically average from two (2) to five (5) watts per square foot. However, architectural or other considerations may make them considerably higher.

3-Phase Calculations For 3-phase systems, we use the following equation: kW = (V × I × PF × 1.732) ÷ 1,000. Again, assuming unity PF and solving this equation for “I,” you get: I = 1,000kW ÷ 1.732V.

A commercial property's load factor is the difference between usable space and rentable square footage. Identifying the load factor helps your tenants understand what they must pay to be in a building with shared spaces they may rarely use.