In-Wall Riser Cat6a: The Bulk Spec
Quick answer / TL;DR: Short answer: specify Cat6a, CMR jacket, 23 AWG solid bare copper, shielded if the route is noisy, in a 305 m box or reel. CMR permits vertical runs in a shaft but not air-handling plenums – those need CMP. Confirm the print reads both the category and the jacket rating, and test after termination.
In-wall riser Cat6a is a bulk purchase with three requirements stacked: the category for 10G, the CMR jacket for a vertical shaft, and a construction that survives being installed once and never seen again. Buying two of the three produces a cable that either fails the test or fails the inspector.
This is the bulk-specification guide: what each requirement covers, how plenum differs from riser, and the order lines that get the right reel delivered.
The Three Requirements
| The requirement | The specification | The failure if wrong |
|---|---|---|
| Category | Cat6a, 500 MHz | 10G not supported at distance |
| Jacket | CMR for risers | Inspection failure, code breach |
| Construction | 23 AWG solid copper | Higher loss, PoE drop |
The three are independent: a CMR Cat5e passes the jacket check and fails the rate, and a Cat6a CM fails the route.
Riser Against Plenum
- CMR: vertical shafts between floors, not air-handling spaces
- CMP: plenums and return-air ceilings, higher cost and stiffer
- CM: general spaces only
- Where the shaft doubles as return air, CMP is the requirement
The distinction is the most common code error in vertical cabling, and it is decided by the space, not by the cable's price.
The Order Lines
| The line | The example |
|---|---|
| Category | Cat6a |
| Shield | F/UTP or U/UTP |
| Conductor | Solid, 23 AWG bare copper |
| Jacket | CMR |
| Pack | 305 m box or reel |
Writing all five lines prevents the substitution that arrives as 'equivalent' and is not.
Standards and Verification
| The reference | The relevance |
|---|---|
| UL 444 / NEC | Jacket ratings and permitted routes |
| TIA-568.2-D | Installation practice |
| ISO/IEC 11801-1 | Class EA |
| Field test | Permanent link test per floor |
Per-market code details are not provided in the knowledge base. The rating ladder is standard; confirm the requirement for the specific shaft locally.
Real-World Applications
The six-floor shaft
A sealed riser serving six floors: Cat6a CMR on code-spaced supports, firestopped at each slab – the pull passed inspection and the 10G links tested at Class EA.
The plenum mistake
A shaft used as return air with CMR already installed: the inspector required CMP. The run replaced – the rating had been chosen by habit rather than by the space.
The substitution
A reel delivered as 'Cat6a equivalent' with no jacket marking: the print unreadable and the CMR claim unsupported. The reel returned and the order restated with all five lines – the ambiguity closed at the dock.
Practical Notes
Bulk Cat6a is heavier and stiffer than Cat5e, so the shaft pull needs more support points and more people. A reel that is right on paper can still fail on site if the handling plan assumes the flexibility of a lower category.
Per-SKU reel weights are not provided in the knowledge base. Confirm the weight and support plan before the pull; a full-height Cat6a bundle is a structural consideration as well as an electrical one.
The two-person pull
A full-height Cat6a pull with one installer: the cable kinked at a mid-floor support. Re-pulled with two people and additional supports – the handling plan corrected by the failure.
The firestop audit
A riser completed without firestops at two slabs: the audit found them before handover. Firestopped and documented – the omission caught by process rather than by luck.
The mixed-floor standard
A building where two floors used Cat5e riser and four used Cat6a: the backbone tested at the lower category end to end. The remaining floors re-cabled – the category had to match across the channel, not per floor.
Related reading: The jacket ladder in full — blogs/news/cable-jacket-ratings
Related reading: The bulk order arithmetic — blogs/news/cat6a-bulk-cable
Frequently Asked Questions
What is in-wall riser Cat6a?
Cat6a bulk cable with a CMR jacket, rated for vertical runs inside a shaft between floors.
Is CMR the same as plenum?
No – plenums and air-handling spaces require CMP.
What conductor should it be?
Solid 23 AWG bare copper for permanent runs and lower loss.
How is it tested?
Permanent link test at Class EA after termination, per floor or per link.
Sourcing cables for a project, a store, or a private-label line? Contact our B2B sales team for specifications, certification evidence, and volume terms – FOB and CIF options available. Request a quote or sample.