Mechanicals · definition
Tying metallic systems together so they can't carry a dangerous voltage difference. Specific bonding is required for gas piping, water lines, and pools.
Source: NFPA — NFPA 70: National Electrical Code
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.