Static field route #19325

What do I do when seismic restraint cables are left too loose?

Seismic Bracing, Sway Control & Structural Coordination⚠️ CHECK BEFORE YOU FIXField answer expansion

📖 Verified core answer

Seismic cables should restrain movement without pulling the duct out of line. Remove sloppy slack and adjust them per the approved seismic detail.

Open in Field Rescue Open category

Field verification checklist

Check lateral and longitudinal brace locations.
Look for slack loops, wrong angles, or cable rubbing other trades.
Tension only per approved seismic detail.
Verify main rods remain plumb.
Photo-document before inspection if needed.

Ask foreman

The seismic cables on [run/location] have visible slack. I checked the brace direction and rods. Do you want them tightened per detail before inspection?

Text to foreman

Route options

AMake the field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects support load path, structural steel, seismic restraint, life safety, another trade, or inspection.

CBring the foreman/detailer the location, what you checked, and what decision you need before loading, cover, startup, or rework.

Do not do this

Do not leave seismic cable loops hanging loose because they “look safer.”

Why this matters

Loose seismic restraints can fail inspection and let ductwork swing hard during movement.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, structural/seismic detail, and AHJ/code requirements.

Search helpers: seismic cable slack loose restraint duct swing lateral longitudinal brace