O.K. You did have SOME experience working with unions.
Most of the equipment I installed was two phase three wire 220/110 with an additional dedicated ground. The computers in the machines liked a zero volt reference without the fluctuations that the neutral inevitably had with the high amp relays opening and closing all the time.
As soon as these pros would hear four wires they would instantly want to provide 440. that kind of overvoltage could instantly fry all my relay boards. I had to meter and double check all the work before initiating any machines. That's why i did much of the wiring myself.
With on board labs on cruise ships, switching from shore to ship power and the electrical bow thrusters would plague the machines with spikes that played havoc withe the computer boards. In those applications I had to condition the power with transformers, rectification, huge battery packs and remodulate the AC with inverter circuits.
The machines had high amperage heater circuits and delicate five and twelve volt computer circuits all fed in from the same 220/110 terminal block.
After the first expensive install I figured out how to isolate the computer circuits from the heat and recirc pump systems within the machines so that I only had to condition the relatively small amperage the sensitometry and optical computers called for. The spikes in the current had no negative effect on the heaters and motors so I was able to cut the installs on ships by thousands of dollars by limiting the conditioned circuits using much smaller off the shelf conditioning units.
All that and I still had to design and manage chemical and silver recovery systems that were immune to ship rolling in rough weather.
Alignment and calibration of the optical systems, sensitometry programing and operator training were the easy parts of an onboard install.
No one I have ever met could wear all the hats I wore in that job, except some of the people I trained.
You never did say what kind of work you do Princess...
Is conduit bending by the book your specialty?
What is the 24 in GU-24 ...you never did say...