Bonding ground wire in main service panel
Shouldn't there be a grounding wire leading from a metal contact of the main breaker box itself (the big grey box that houses the service coming in and all of the smaller breakers) to the neutral/ground buss bar?
When I use a simple light tester and connect one probe the hot terminal of a 15 or 20A breaker and connect the other probe to the neutral/ground buss bar, it lights up. When I move that 2nd probe from the buss bar to the metal box itself, nothing. Shouldn't the box itself be bonded to the buss bars in some fashion? If it were bonded, wouldn't my tester light up?
Thanks in advance.