I thought a 12 gauge extension cord was good enough for a 20 amp outlet, however, this 12 gauge cord I purchased says maximum 15 amps. Would it be safer not to
Extension Cord Size Chart
DUROMAX 25 ft. 12 Gauge Portable Generator Triple Tap Extension Power Cord XPC12025C - The Home Depot
What's the Right Extension Cord Length for My Tools? — DO IT: Projects, Plans, and How-tos