Termination point for system bonding jumper

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Jpflex

Electrician big leagues
Location
Victorville
Occupation
Electrician commercial and residential
a feeder was ran to a small shed to hold a 240 volt air compressor, 1 receptacle and a heat lamp

The feeder input is 2 hot wires and a ground at 240 volts flood for the compressor, but I needed to step down the voltage to 120 for the heat lamp and single gang 20 ampere receptacle

When deciding whether to install the system bonding jumper in the transformer x output or the transformers secondary breaker box (separately derived system first point of disconnect), I chose the transformer by connecting the transformers x2,x3 and derived neutral wire to all EGC in transformer

Or I could have left grounds at transformer connected together and to case but separate from neutral connection at transformer and just bonded neutral to ground buss at downstream breaker box for secondary protection with neutral buss empty

I did not do the latter because of the lack of space in one ground buss and confusion it may have caused to another worker.

What do y’all think?
 

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Bottom picture is mini breaker box for secondary winding and conductor protection limited to 20 ampere circuit breaker for receptacle and 250 watt heat lamp
 
Also every structure or building supplied by a feeder must be provided with a grounding system (rods)

However can one ground rod connected to another ground rod 6 feet apart be connected to the transformers (downstream) secondary protection box neutral buss satisfy this requirement

or does the sheds feeder termination point at the first (upstream) breaker box before the 3KVA single phase transformer need to be grounded first

or do I bond the two breaker box cabinets together and ground at second downstream breaker box?
 
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