Home has a 200 amp FPE main panel. There were a few concerns with the main panel as it was an FPE, had open cover knockout at cover, double tap, low voltage transformer in panel, open knock outs and over crowded wiring and a few other issues as well.
There was a 100 amp sub panel connected and what I have never seen before is they connected all the neutral ground connections in the main and just ran the hot to the sub breakers. One reason for the over crowded wiring. The had all the neutrals and grounds separated in the main.
I referred both panels to a sparky as I would replace the FPE and leave it to the electrician if he is going to use the sub or just add one larger main panel box.
What are your thoughts on the wiring to the sub panel? Is blue an acceptable wire color to use?