Typically when I enter a MCC section I use a Myers Hub I learned today this hub is not rated for bonding. What confuses me about that is 99% of the time the pipe is continuous from end to end including with the mcc section. My first question is how is the path to ground is considered continuous with a Myers hub even though its not considered bonded? Also based on 250.97 would I have to have a ground bushing for anything a Myers hub goes into above 250volts even if it is not a concentric or eccentric knockout? (I knock out 95% of my holes with a KO punch or step bit) My second question is when I leave the MCC to go to a hazardous area do all my pipes entering that MCC going to the hazardous location (not including the service conductors) need to be mechanically bonded in the head section of the MCC since Myers hubs are not considered a bond would I need a bonding bushing to make this code compliant since nearly all of them are 250volt or higher?
(Long story short in all my time doing this I have never been called on it or told differently but I am very confused cause I've seen big electrical contractors do this for years no problem it's how pretty much all of the plant I work for is wired if this is correct I guess I should've been using a double locknut this whole time except for hazardous locations.)
(Long story short in all my time doing this I have never been called on it or told differently but I am very confused cause I've seen big electrical contractors do this for years no problem it's how pretty much all of the plant I work for is wired if this is correct I guess I should've been using a double locknut this whole time except for hazardous locations.)
Last edited:
