Clearance around electrical panel

What is the code for clearance around an electrical panel. The inspector stated the following in the report…
Main Panel - Did not have proper clearance around the electrical box. Electrical standards require 36 inches on both sides and in front of the box.

I have found one that states 30 inches for an opening.

This is wrong. ESA Rule 2-308(1) requires 1m (39") clearance to the front of the panel, not 36". You also need 1m (39") side clearance, not 30".

Rule 2-308(1) Minimum Working space of 1 m

Here’s a correct image,
http://www.hvactechgroup.com/hvacforum/index.php?action=dlattach;topic=1048.0;attach=766;image

Just imagine putting an empty cardboard refrigerator box in front of it to give you an idea :wink: