In Plain English
Quick Answer
The unit used to measure how much power an electrical device uses — what you see on a light bulb's label.
Definition
Definition
The fundamental unit of electrical power, equal to one joule per second, representing the rate at which electrical energy is consumed or produced. Watts are calculated by multiplying voltage by current (W = V × A). Electrical equipment is rated in watts or kilowatts to indicate power consumption.
Context
Why It Matters in Bidding
Watts and kilowatts let estimators translate equipment loads into the electrical scope, from panel and circuit sizing to service capacity. Connected load in watts also feeds energy code calculations and generator or transformer sizing, so an estimator reading equipment ratings must roll them up correctly to confirm the design infrastructure carried in the bid is adequate.
Example
Example
Tallying the lighting and equipment schedules, the electrical estimator sums the connected load in watts per panel, converts to kilowatts to check the service size, and confirms the specified gear has enough capacity before pricing the feeders and panelboards.
See Also
Related Terms
FAQ
Questions Contractors Ask
How do watts factor into an electrical estimate?
Equipment wattage rolls up into connected load, which drives circuit counts, panel and feeder sizing, and overall service capacity. Estimators read wattage from equipment and lighting schedules, convert to kilowatts for larger loads, and verify the specified gear can carry it before pricing the distribution scope.
What is the difference between watts, volts, and amps in pricing?
Watts measure power, equal to volts multiplied by amps. Estimators care about watts for total load and energy calculations, but size conductors and breakers in amps at a given voltage. Getting the relationship right matters when converting equipment ratings into the wire and overcurrent protection the bid must cover.
Why does connected load in watts matter for the bid scope?
Total connected load determines whether the specified service, transformers, and generator have adequate capacity. If the estimator's rollup exceeds the design, it signals a coordination issue or potential change order. Accurate wattage tallies also support energy code compliance documentation the project may require at closeout.
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