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Re: Update - Replacing Light Switch with Switch/Receptacle C


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Posted by John T on February 13, 2023 at 05:32:09 from (107.72.178.101):

In Reply to: Re: Update - Replacing Light Switch with Switch/Receptacle C posted by caterpillar guy on February 13, 2023 at 02:32:01:

Good morning Caterpillar Guy, as a retired Power Distribution Design Engineer I can happily confirm:

1) YOU ARE RIGHT when you say neutral and ground wind up at the same place in the main box (provided its the main panel (first disconnect).......

2) YOU ARE RIGHT in that typically in the main panel they can be connected to the ground stake.

HOWEVER with all due respect FYI and others who aren't engineers/electricians or know otherwise, let me explain the panels NG Bond. The NEC TYPICALLY requires N and G to be bonded in the main panel BUT NOT THEREAFTER (there shall be ONLY ONE NG BOND). The Equipment GroundING Conductor is to carry FAULT CURRENT ONLY while the Neutral only carries normal return current. With it bonded to N in the main panel if there is a fault it (EGC) provides a low resistance back to the panel to trip the breaker and clear the fault TO SAVE YOUR LIFE

The EGC is often bonded to outer conductive metallic cases of tools and appliances washers dryers toasters etc which you touch.

UNLIKE an often bare EGC Conductor, the Neutral is a hot live current carrying conductor AND IS INSULATED to prevent your contacting it

HOWEVER if N and G are re bonded downstream from the main panels NG bond THE EGC (connected to tools and appliances washers dryers toasters etc) CAN BECOME A HOT LIVE CURRENT CARRYING CONDUCTOR and you can get shocked when you touch it

SOOOOOOOOO yes you are indeed correct NG are bonded in the Main (but not again) for the reasons I noted above BUT EACH SERVES A DIFFERENT PURPOSE and if used correct CAN SAVE A LIFE OR PREVENT A FIRE

Dont take my word for it consult the NEC or any professional engineers or electricians

Best wishes and God Bless I hope this helps you understand the purposes of N and G and why they ARE DIFFERENT FOR DIFFERENT USES........Ground to carry ONLY Fault current (to trip breaker and save a life) ...........Neutral to carry ONLY normal return current..........

Have a great day now post back any questions

PS With all due respect NOOOOOOO my intent is NOT to blow smoke but to help my fellow old tractor lovers, explain things, and maybe even prevent a tragedy !!! Im here to HELP not feud lol

John T Long retired EE but believe this remains true........


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