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Most of the time a 30A circuit is going to use 10 ga. wire.


If the ext. cord is 25' or less, 10 ga. is what you need. If 25'-50', go with 8 ga. This may be a bit of overkill, but you will never have problems with the ext. cord.

See top chart... http://www.cerrowire.com/voltage-drop-table

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