Bond subpanel Neutral directly to SE neutral using split bolt?
Is it OK to bond the neutral from a garage subpanel directly to the main SE neutral using the proper copper split bolt and also use a split bolt to connect the subpanel ground to the main panel ground where it ties to the outside ground rod?
The SE cable is 4/0 aluminum and the neutral from the subpanel is #4 THHN copper. I planned on applying Nolox if it is OK to do this. I got this recommendation from a friend of my fathers who is a master electrician. He said it would be fine and should not cause any problems.
The problem is that none of slots in the neutral/ ground bus will take a #4 and this is an 60 year old Bulldog Pushmatic 200 amp panel. I plan to replace it in the spring with a new Cutler Hammer but I live in Indianapolis and it is too cold here now to have the heat off long enough to do the changeover.
Someone mentioned using a new ground bus and moving it in the box to accommodate the grounds and change the neutral bus to accept the #4 wire. There just does not seem to be any room in the box to do this?
You *can* do it. Just make sure youre connections are made inside the main panel. Also make sure you use a dual rated split bolt.
What you are proposing to do is relatively dangerous. Your neutral is NOT protected or able to be D/Ced. I recommend that you throw your main breaker before doing this. If your neutral is lost at the pole for whatever reason and youre main is not off the current may be drawn through you......
"Do it right the first time and avoid duplication of effort"
Your AHJ/Inspectors ALWAYS have the final say on ANY electrical code issue.
If in doubt, contact a licensed, experienced, reputable electrician to perform the work.