Also, be aware that not all 20 Amp circuits are necessarily true 20 Amp.
We have been asked to work on jobs with temp power boxes that are crappily installed and existing older service panels that are dangerous.
We will add a damages clause in the contract or not offer a contract at all.
Best thing to do is, learn about power and how to measure it or stay away from quality power tools. Yes, I've burnt a Kapex!