Division 27: Communications
Division 27 includes all specifications for structured cabling, voice/data systems, communication outlets, racks, patch panels, and telecom room requirements. Master this division to properly coordinate and estimate low-voltage scopes.
🎥 Study Video
Insert your communications estimating and plan reading tutorial here.
📄 Communications Cheat Sheet
Download our Division 27 cheat sheet with cabling types, riser diagram basics, and BICSI coordination practices.
Download Communications Cheat Sheet(Replace this link with your actual reference.)
💡 Instructor Insights
- Look for specs around Cat6, Cat6A, fiber optics, and patching methods.
- Check for equipment rack layouts, telecom room sizes, and grounding instructions.
- Division 27 often references BICSI standards — include coordination with MEP trades.
- Always verify outlet counts, cabling pathways, and firestopping around penetrations.
📥 Quiz & Resources
Test your knowledge of structured cabling, telecom coordination, and BICSI compliance from Division 27.
- Which cable types are typically listed in Division 27?
Answer: Cat6, Cat6A, fiber optic, coaxial, and patch cords. - What should you verify about telecom equipment racks and rooms?
Answer: Layouts, rack clearances, HVAC coordination, grounding, and electrical support. - What standards are often referenced in Division 27?
Answer: BICSI standards for installation, cable support, labeling, and testing. - What coordination is required between Divisions 26 and 27?
Answer: Division 26 provides power and conduit; Division 27 handles data cabling and equipment. Ensure no gaps or overlaps. - Why is firestopping important in communications systems?
Answer: Cables penetrate fire-rated walls and floors — Division 27 may require specific firestop materials and UL assemblies.
Division 27: Communications Systems
🔹 Key Teaching Points
1️⃣ Structured Cabling Systems
- Specs will list cable types: Cat6, Cat6A, fiber, coax, and patch cords. Match to drawing symbols and riser diagrams.
- Double-check patch panel type, mounting height, and color coding if listed.
2️⃣ Equipment Racks & Telecom Room Layouts
- Look for required layouts of IT rooms, MDF/IDF clearances, cable tray routes, and grounding/bonding specs.
- Power, HVAC, and pathway coordination are critical with MEP trades.
3️⃣ BICSI Standards & Trade Coordination
- Specs may require compliance with BICSI standards for cabling, pathway support, and testing.
- Review responsibilities between Division 26 and Division 27 — power vs. data rough-in.
4️⃣ Outlet Locations, Pathways & Firestopping
- Verify quantity and location of outlets. Look for modular faceplates and jacks listed in schedules.
- Confirm routing and protection for cabling — especially firestopping at wall and floor penetrations.
✅ Wrap-Up Summary
- Division 27 defines the backbone of modern communications — from racks to patch cords.
- Coordinate carefully with electrical, HVAC, and firestopping trades.
- Don’t forget testing, labeling, grounding, and submittals — especially on BICSI or public agency jobs.