Division 27 Communications
Detail or Installation Mismatch in Division 27 Communications submittals
Short answer
The submitted detail, dimension, anchorage, or installation method differs from what the spec or drawings require. Default grade in Division 27 Communications: Fix and Resubmit.
The submitted detail, dimension, anchorage, or installation method differs from what the spec or drawings require. This guide covers how it shows up specifically in Division 27 Communications submittals.
What to look for in Division 27 Communications
- Cable pathway type mismatch (conduit vs cable tray vs J-hook vs innerduct) - spec may require specific types in specific locations
- Conduit size undersized for cable count at 40% fill per TIA-569
- Cable bend radius - submitted cable specs must support the minimum bend radius for the installation method
- Firestop method at penetrations differs from spec or UL-listed assembly
- Outlet height for work area outlets differs from spec or ADA requirements
- Rack grounding method (TGB, TMGB) differs from TIA-607 or spec
- Cable support spacing (J-hook, cable tray support) does not meet TIA-569 or spec
- Patch cord length or type at work area outlets differs from spec
- AP mounting method (ceiling tile, hard-lid, wall) differs from design
- DAS antenna type or placement differs from RF design coverage model
- AV signal routing (HDMI, HDBaseT, AVoIP, fiber) differs from spec
How severe is it?
Default grade: Fix and Resubmit. Escalates to Blocker when the difference affects a fire-rated, seismic, or structural assembly.
Deviation Check assigns a default per category and escalates or de-escalates based on the spec, always showing its reasoning. See the Division 27 severity rules.
What the PM should do
Stamp the submittal Revise and Resubmit. Mark the deviation, return the relevant spec passage as a redline, and have the sub correct and re-send before fabrication or installation.
Other deviation categories in Division 27
Frequently asked questions
What installation method mismatches in Division 27 Communications submittals escalate from Fix and Resubmit to Blocker?
Any mismatch that touches a fire-rated, seismic, or structural assembly escalates to Blocker. The most common case is a firestop method at cable penetrations that differs from the UL-listed assembly required by the spec. A submitted rack grounding method that departs from TIA-607 or the spec requirements also escalates when the building has seismic bracing requirements, because the grounding and bonding path is part of the structural tie-down assembly.
How does conduit sizing get flagged as a detail mismatch in a Division 27 Communications submittal, and what standard governs the limit?
TIA-569 sets the maximum cable pathway fill ratio at 40%. When the submitted conduit size cannot fit the cable count at that fill ratio, the pathway is undersized and the detail is flagged as a mismatch. Cable bend radius is a related check - the submitted cable spec must confirm the minimum bend radius is achievable in the conduit routing shown, particularly at junction boxes and pull points.
View this page as Markdown for LLMs and note-taking.