Structured Cabling BOM for a 100 Node Office

A complete bill of materials with the quantity calculations behind each line — for budgeting, tendering or checking someone else's estimate.

Most cabling estimates go wrong in the same two places: the point count is taken as the desk count, and the cable quantity is calculated from straight line distances. Both understate the job, and both surface as variations partway through installation.

This walkthrough uses a worked example — a single floor commercial office, 100 network points, one centrally positioned rack — and shows the arithmetic behind each line so you can substitute your own numbers.

Step 1: Establish the real point count

The most common error at the outset. A 100 desk office does not need 100 network points.

Standard practice is two outlets per desk: one for the workstation, one spare for a phone, a printer, a dock or a future device. Adding cable during initial installation is cheap; adding it afterwards through a finished ceiling is not.

Then add the infrastructure points that are easy to forget:

•    Wireless access points — roughly one per 1,000 square feet, ceiling mounted, PoE powered

•    Network printers and multifunction devices

•    IP cameras — entry points, corridors, server room

•    Access control readers and door controllers

•    Meeting room displays, video conferencing units and room booking panels

•    Reception and visitor points

•    Building management and HVAC controllers

 

A 100 desk office commonly lands between 220 and 250 points once these are counted. For this worked example we hold to 100 points so the arithmetic stays clear — but scale accordingly on a real project.

Step 2: Calculate cable quantity

Work from the actual cable route, not the plan distance. The route includes the drop from the outlet up to the ceiling, the horizontal run through containment, the rise at the rack and the service loops at both ends. A 65 metre straight line commonly becomes a 90 metre route.

The calculation for 100 points:

Step	Calculation	Result
Average run length	Nearest + furthest ÷ 2	45 m
Total cable	100 × 45	4,500 m
Wastage allowance	+10%	4,950 m
Boxes required	4,950 ÷ 305, rounded up	17 boxes
Order quantity	Round to pricing tier	20 boxes

 

Verify the 90 metre permanent link limit for the furthest outlet before committing to a single rack position. If the furthest run exceeds it, either move the rack or add a second telecom room. Stretching a run past 90 metres is one of the errors covered in our guide to Cat6 installation mistakes that fail certification.

Ordering the full quantity in one go matters beyond price: cable from a single production run behaves consistently across the installation. Details on packing conventions are in our note on 305 metre boxes versus 1000 foot rolls.

Step 3: The full bill of materials

Cable and terminations

Item	Quantity	Notes
Cat6 UTP cable, 305 m box	17–20	Bare copper, 23 AWG
Cat6 keystone jacks	110	100 + 10% spares
Faceplates, single/dual gang	50–100	Depends on outlets per plate
Surface or flush back boxes	50–100	Match faceplate count
Cat6 patch panels, 24 port	5	120 ports, spare capacity
Patch cords, 1 m (rack side)	110	Panel to switch
Patch cords, 2–3 m (desk side)	110	Outlet to device

 

Patch cords are the line most often missed, and 200-plus cords is a material cost. They must be the same category as the cable — Cat5e cords on a Cat6 installation reduce the whole channel to Cat5e.

Rack and management

Item	Quantity	Notes
42U floor standing rack	1	800 mm deep minimum
Horizontal cable managers, 1U	5–6	One between panel pairs
Vertical cable managers	2	Both sides of rack
Power distribution units	2	Dual feed where available
Rack shelves	1–2	Non-rackmount equipment
Rack fan tray	1	Essential with PoE switches
Earthing kit	1	Rack bonding

 

Rack space budget: 5U panels, 6U management, 3U switches, 2U UPS or PDU, 2U spare — roughly 18U used of 42U, leaving genuine growth room. Undersizing the rack is a false economy that surfaces at the first expansion.

Containment

Item	Sizing basis
Cable tray / basket	Sized for full cable count at 40% fill
Vertical risers	Where cable changes level
Conduit to outlets	Drop from ceiling to back box
Fire stopping	Every fire compartment penetration
Support and fixings	Tray brackets, threaded rod, anchors

 

Size containment at around 40 percent fill rather than capacity. A tray packed full cannot accept additions, and cables at the centre of a dense bundle cannot shed PoE heat. Fire stopping is frequently omitted from estimates and is not optional where cable crosses a fire compartment.

Consumables and test

Velcro straps rather than nylon ties, labels and a labelling system, pulling lubricant for long runs, draw ropes, cable ties for temporary dressing only, and a certification field tester — usually hired rather than bought for a single project. Budget the tester and the time to use it; certification is what converts an installation into a warrantable one.

Step 4: Cost distribution

Indicative shares for a project of this size, useful for sanity checking a quotation:

Category	Approx. share
Labour	35–45%
Containment and fixings	15–20%
Cable	10–15%
Jacks, panels, patch cords	10–15%
Rack and management	5–10%
Testing and documentation	3–5%

 

The implication is worth stating: cable is a small share of the total. Downgrading cable specification to save money saves very little against the project while capping the installation's performance for its full service life. This is why apparent bargains in Cat6 pricing deserve scrutiny rather than enthusiasm.

Step 5: Decisions to settle before ordering

Category. Cat6 for general office work; Cat6a where 10 Gigabit over full distance is required. Our category comparison covers the trade-offs.

Jacket. PVC as standard; LSZH where the fire strategy or specification requires it. See LSZH versus PVC.

Conductor. Solid bare copper, stated in writing on the quotation.

PoE load. Count the powered devices, size the switch budget accordingly, and limit bundle sizes on the affected runs.

Outdoor segments. Any run leaving the building needs outdoor rated cable and a grounding strategy.

Frequently asked questions

How many network points does a 100 person office need?

A common planning ratio is two outlets per desk, which gives one for the workstation and one spare for a phone, printer or future device. Add outlets for wireless access points at roughly one per 1,000 square feet, plus points for printers, cameras, access control and meeting room equipment. A 100 desk office therefore often needs closer to 220 to 250 points, not 100.

How many 305 metre boxes of Cat6 for 100 points?

At an average of 45 metres per run, 100 points needs about 4,500 metres. Adding 10 percent wastage brings it to roughly 4,950 metres, which is 17 boxes of 305 metres when rounded up. Adjust the average run length to suit your floor geometry and rack position.

How many patch panels for 100 network points?

Using standard 24 port patch panels, 100 points needs five panels, which gives 120 ports and leaves spare capacity. Allow one rack unit of cable management between each pair of panels, so the panels and management together occupy about 10 rack units.

Cable supply for your project

Nakoda manufactures Cat6 UTP LAN cable in India with solid bare copper conductors, a central PVC spine and 250 MHz rating, supplied in 100 metre and 305 metre boxes.

Send us your point count, floor details and delivery city and we will confirm quantity and current pricing. Submit a bulk enquiry and our team will respond within one working day.

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