🧠 Plain English Breakdown:
• Permit & duration (110.1): Temporary uses, equipment, and systems require a permit and are time-limited (max 180 days). Extensions allowed for cause.
• Conformance (110.2): 'Temporary' ≠ 'anything goes.' Installations must meet the IMC to the extent needed for health, safety, and welfare.
• Temporary utilities (110.3): The AHJ may authorize temporary service utilities — see Section 109.
• Termination (110.4): The AHJ can terminate and order discontinuance if the installation is unsafe, noncompliant, or beyond scope or time.
🏗️ Why It Matters: Temporary heat / cool, negative air, construction dehumidification, temporary boilers / chillers, and generators are often critical to schedule — but the AHJ can pull the plug if they're not permitted, safe, or properly vented. Plan the temporary system like a permanent one: combustion air and venting / clearances, electrical capacity and OCPD, fuel storage and CO / NOx control, make-up air for negative pressure, and removal / restore at the end.
🔧 Field Tip: Submit a one-page temporary plan with your permit request:
• Purpose & duration: Start / end dates, requested extension trigger.
• Equipment & fuel: Models, input, listing, MI pages.
• Life safety: Venting path, clearances, CO monitors, make-up air, spill / containment.
• Power: Source, feeder / OCPD, GFCI where required.
• Controls & supervision: Lockout / tagout, daily check log, shutdown criteria.
• Decommissioning: Removal, patching, firestop restoration, cleaning.
Coordinate temporary utility authorization with the AHJ before energizing.