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Start saving time with our free tools for electrical contractors
Kopperfield load calculator

Load calculator

Calculate electrical loads with NEC 
defaults and downloadable PDFs
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Kopperfield single line diagram tool

Single line diagrams

Generate single line diagrams from
a library of common templates
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Kopperfield generator sizer

Generator sizer

Input loads and get precise generator
recommendation sizes instantly
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Voltage drop calculator

Quickly detect voltage loss to pinpoint
wiring issues and prevent problems
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