“Upgrade the factory electrical system” is too vague for a clean bid. Split the plant into layers before you issue an RFP.
Useful layers
Incoming supply and main board, distribution to sub-boards and machines, critical circuits, and building systems (lighting, fire alarm, CCTV, network, lightning).
Why layers help
Each layer has different standards, owners, and outage rules. Bundling everything without sequence usually stalls coordination with production.
Before the RFP
State the goal—line expansion, fewer trips, or solar-ready capacity—then scope by layer.