This is where your ‘wiggy’ comes in handy. You know the neutrals and grounds are bonded, they share the same bus bar, you need to know if the enclosure is bonded. Wiggy from either hot leg to enclosure will tell.
I’m fairly certain I’ve seen older SQ D panels with an interior label identifying the bond location. Problem is that the panels are typically so full that you would really have to “dig in” to move the wiring out of the way enough to see it. Not something I really like doing. I will try to use my long insulated screwdriver to carefully shift the wiring, but generally speaking it is sketchy at best.
@ rsteinmetz To further clarify, a “wiggy” or solenoid tester, vibrates in your hand when the solenoid is activated by a live circuit which you can feel by the vibration in your hand (as well as a light or orange bar on the scale). This lets you know that what you’re measuring is truly a hot/live circuit. When measuring with a multimeter, sometimes you will see a phantom voltage, typically induced by other circuits, that is not actually “hot” but you’ll read a voltage. A sparky may be able to explain it better than me
And to further clarify… “Wiggy” is a Brand name of an old timey solonoid tester that is no longer manufactured, so all the old farts will call any solonoid tester a “Wiggy”, so it has become a slang term, much the same as Romex instead of NM-cable.