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Welcome. My name is ***** ***** would be glad to assist.
Thanks for the details on the situation.
The key here, is that the neutral and ground will ONLY come in contact with each other at the Main location.
There after, the ground and neutral must be completely isolated from each other.
Also, in your situation, since the location at the garage is a separate structure, you are required to install grounding rods to add to the ground connection.
See the below diagram fro an example, which shows how sub panels are installed in detached buildings from the Main disconnect.
Let me know any questions,
From the posting, the house panel is existing.
Anything existing does not change, only new installations are required to be in the newer requirements.
If the house is also a brand new installation, then it should be wired with 4 wires and connected the same as the garage.
No, the sub panel does not get the bonding screw through the neutral bar either.
Ground and neutral 100 % separated
Dont why the question, but yes, it carries current just like a hot.
Because the neutral grounds at the Main, that is required at the main only.
It is a 3 wire power at the main.
The main is where the ground starts, then it is separated and 4 wire from it to any other locations.
Required Neutral-to-Case Connections.Service Disconnecting Means [250.24(B)]. Because electric utilities are not required to install an equipment grounding conductor, alternating-current services supplied from a grounded utility transformer shall have a grounded (neutral) conductor run from the electric utility transformer to each service disconnecting means. The grounded (neutral) conductor shall be bonded to each disconnecting means’ enclosure (neutral-to-case connection) by a screw or strap supplied by the equipment manufacturer [250.28]. Figures 37 and 38 250-24B 01.cdr 250-24B 02.cdr
If there is no disconnect at the pole now, and the power runs from the meter to the house panel, then the house is the main now.
If you now install a new disconnect at the meter, the house becomes a sub panel, and it MUST have a 4 wire feeder tot he panel, the 3 wire feeder is obsolete.
I understood the situation as there was an existing disconnect and you were just changing it to a different type to feed thru
Well, wish I could say yes, but code dictates the rules and I have to provide the information accordingly through my state licensing and for the safety of the ground fault path.
Main only with the neutral to ground bond.
Not sure what 2 hots are doing for you with only 240 volts?
Would be best to come off the main panel at the house, but understand it may be further away in some applications.
You do not connect the ground to the neutral in junction boxes, never allowed at anytime.
You are creating a path for current on the ground, if the neutral ever is broken. Very dangerous.
That is a long run for this happen on also
Underground aluminum will fail at some point in time if not in conduit, repair these all the time.
I am not sure of what you are asking, sorry. It sounds like you wish for me to provide something different than what I have done thus far.
I can give the direction of how it is supposed to be wired by the code for your safety and operation and that is all I am allowed to do.
I think it is posted unless something is unclear on the previous postings?
I cannot provide instruction for wiring that could be dangerous or against code.
I understand the dilemma, but please understand my responsibilities also.
What you wish to perform would not be permitted by the local jurisdiction, so if anything did take place, the insurance probably would not cover in the situation.