Structured cabling · Fibre · Wireless · Data centres
Anyone can pull cable. We hand you the evidence.
Data Cablers designs, installs and certifies the physical layer for corporate estates, data halls and national rollout programmes across London, Hertfordshire and the wider UK. Every link is tested. Every link is labelled. Every result is in your hands on the day we hand over — because an installation you cannot audit is a claim, not a standard.
A division of The Specialist Electrical Group Limited — NICEIC-certified electrical contractors operating across London, Hertfordshire and the South East. Containment, fire stopping, cabinet supplies and cabling are delivered by one accountable contractor on one order.
01 · Corporate estates
IT, property & facilities directors
Multi-site frameworks, fit-outs, refurbishments and estate-wide standards. One rate card, one labelling scheme, one record set across every building you hold.
Cabinet builds, cross connects, pre-terminated MTP trunk, containment and live migrations. Permit-driven, out of hours, to the hall's rules rather than ours.
Two regulatory changes this year rewrote the brief. Most cabling contractors have not read either.
Structured cabling stopped being a low-risk trade the moment power started travelling down it and the moment the spectrum your wireless design depends on was re-cut. We track the instruments, we design to them, and we put the reference on the quotation so there is nothing to argue about at handover.
Instrument 01 · Published 15 April 2026
Power over Ethernet is now inside the Wiring Regulations
BS 7671:2018+A4:2026 introduces a dedicated Section 716 for Power over Ethernet, together with a new section on functional earthing and functional equipotential bonding for information and communication technology equipment. The previous edition, BS 7671:2018+A2:2022 incorporating A3:2024, is withdrawn on 15 October 2026.
The consequence is direct. A PoE installation delivering up to 90 W per port under IEEE 802.3bt Type 4 is no longer purely a data question — bundle sizing, heat rise, conductor selection and earthing arrangements now sit within the scope of the national wiring standard. A data contractor without in-house electrical competence is now designing outside its own certification.
Data Cablers holds that competence inside the group. Our electrical division is NICEIC certified; PoE design, containment and bonding are delivered and signed off under one accountable contractor.
Instrument 02 · Statement 20 July 2026
Ofcom has opened the whole of 6 GHz — on conditions
Ofcom has adopted a hybrid-sharing framework for the upper 6 GHz band (6425–7125 MHz). Wi-Fi takes priority across 6425–6585 MHz; mobile takes priority across 6585–7125 MHz. Licence-exempt Low Power Indoor and Very Low Power operation is permitted, while higher-power and outdoor deployment must operate under Automated Frequency Coordination.
This is materially more spectrum for Wi-Fi 7 than the lower 6 GHz band alone offered — and it changes channel planning, access point density and, critically, the backhaul cabling underneath. Low Power Indoor limits mean range falls, access point counts rise, and the containment and cabling design rises with them.
Any contractor quoting a Wi-Fi 7 refresh in 2026 without a fresh predictive design and validation survey is quoting a number, not a network. We will say so before you sign.
The full standards registerSources: IET and BSI, Amendment 4:2026 to BS 7671:2018. Ofcom statement on expanding access to the 6 GHz band, July 2026. Positions stated as at August 2026.
● Cat5e● Cat6● Cat6A● Class F / Fₐ● OM3● OM4● OM5● OS2 singlemode● MTP / MPO trunk● Fusion splicing● Tier 2 OTDR● Wi-Fi 6E● Wi-Fi 7● Full-band 6 GHz● PoE to BS 7671 Section 716● Cold aisle containment● Cabinet builds● Cross connects● Rack remediation● Adds, moves & changes● Comms cabinets — wall & floor● UPS & battery systems● Power supplies & distribution● PDU & metering● Microsoft Teams Rooms● AV & digital signage● Golden thread records● CPR Euroclass traceability● Cat5e● Cat6● Cat6A● Class F / Fₐ● OM3● OM4● OM5● OS2 singlemode● MTP / MPO trunk● Fusion splicing● Tier 2 OTDR● Wi-Fi 6E● Wi-Fi 7● Full-band 6 GHz● PoE to BS 7671 Section 716● Cold aisle containment● Cabinet builds● Cross connects● Rack remediation● Adds, moves & changes● Comms cabinets — wall & floor● UPS & battery systems● Power supplies & distribution● PDU & metering● Microsoft Teams Rooms● AV & digital signage● Golden thread records● CPR Euroclass traceability
Capability · Copper, fibre, wireless
We will tell you what you need. Not what you asked for.
Every contractor will quote whatever category you name. We price the correct one, evidence the difference in writing, and where the cheaper specification will serve the building for the next fifteen years we say so and record why. That position costs us margin on the day. It wins us the estate.
Conductor — annealed copper
Copper
Balanced twisted pair designed to BS EN 50173-1 and installed to BS EN 50174-2. Screened or unscreened, LSZH sheathed, CPR Euroclass selected against the building's fire strategy and recorded with its Declaration of Performance.
Cat5eClass D · 100 MHz
Cat6Class E · 250 MHz · 10G to 55 m
Cat6AClass EA · 500 MHz · 10G to 100 m
Cat7 / 7AClass F / FA · S/FTP · 600–1000 MHz
PoE802.3bt Type 3 & 4 · to 90 W
Straight answerCategory 7 is an ISO/IEC 11801 class. It is not recognised by ANSI/TIA-568 and it requires GG45 or TERA connectors to actually deliver Class F at the outlet. Nine times in ten Cat6A is the better commercial decision. We will show you the arithmetic before you commit, in writing.
Jacket — aqua OM3 / OM4 · yellow OS2
Fibre
Backbone and horizontal fibre where distance, bandwidth or electrical noise rules copper out. Fusion spliced, pre-terminated or field terminated to suit the programme, with Tier 1 loss and Tier 2 OTDR results issued as standard.
OM3Multimode · 10G to 300 m
OM4Multimode · 10G to 550 m
OM5Wideband · SWDM ready
OS2Singlemode · campus & external
TestingIEC 61280-4-1 & -4-2
Straight answerIf your backbone is OM1 or OM2 you are already capped and every switch refresh will be constrained by it. Pre-terminated trunk reduces a data hall installation to a fraction of the time on site, and on a live floor that is usually the entire argument.
Design — predictive, then validated
Wireless
Wi-Fi that was designed, not guessed. Predictive design against the drawings, validation survey against the built environment, and a report that evidences the coverage, capacity and roaming performance you paid for.
Wi-Fi 6802.11ax · 2.4 & 5 GHz
Wi-Fi 6ELower 6 GHz · LPI / VLP
Wi-Fi 7802.11be · MLO · 320 MHz
Upper 6 GHz6425–6585 MHz Wi-Fi priority
BackhaulCat6A minimum for 6E and 7
Straight answerThe July 2026 Ofcom decision expands the usable band but keeps indoor operation at Low Power Indoor limits without AFC. More spectrum does not mean fewer access points. Anyone telling you otherwise has not read the statement.
Rack build: switches, patching and UPS in a lockable cabinet.Fibre tray dressed and labelled before termination.Outdoor cabinet: fibre-fed switch, clear routes.Access point fed from a certified Cat6A link.
The deliverable
The cable is not the deliverable. The evidence is.
Workmanship you cannot inspect is an assertion. Select any port below and you will see precisely what is returned to you for every single link on your estate — whether the order is four points or four thousand.
* Indicative service statements. Free survey and design, quotation and RAMS turnaround, out-of-hours availability and warranty availability apply within our normal operating area and are subject to survey findings, site access and our standard terms and conditions of sale. They are not a contractual commitment unless confirmed in writing.
Select a port. This is the record you receive, per link.
Cabinet CR-01 · 24-way Cat6A · 1U
CR-01 / APermanent link · tested to IEC 61935-1
Link ID
CR-01-A-01
Serves
Desk outlet
Cable
Cat6A F/FTP
Test limit
Class Eₐ
Length
25.3 m
NEXT margin
+2.8 dB
Return loss
+3.4 dB
CPR class
Cᶜᵃ-s1b,d2,a2
Result
PASS
Illustrative record. Issued certificates carry the tester serial number, calibration certificate date and adapter type on every page, supplied as the native tester file together with PDF, so the results can be reopened and re-interrogated in ten years rather than merely read.
Six documents. Every project. No exceptions.
01Test certificate for every linkNot a sample. Not a summary. Headroom shown per link, so a marginal pass cannot conceal itself inside an average.
02Labelling scheduleOutlet, panel port and cabinet identified consistently at both ends, to the administration principles of BS EN 50174-1.
04Photographic recordCabinet as found and as left, containment before ceilings close, fire stopping at every penetration before it is concealed.
05Materials and product recordCable batch, CPR Euroclass, Declaration of Performance and manufacturer identified for the whole channel.
06Warranty registered by usWhere a manufacturer system warranty applies we complete the registration and issue you the certificate. It does not sit on your desk to chase.
Extract · permanent link resultsAll pass
Link ID
Limit
Length
NEXT margin
CR-01-A-01
Class EA
38.4 m
+4.1 dB
CR-01-A-02
Class EA
41.7 m
+3.6 dB
CR-01-A-03
Class EA
29.2 m
+5.2 dB
CR-01-A-04
Class EA
52.8 m
+2.9 dB
CR-01-A-05
Class EA
44.0 m
+3.4 dB
Tester: Fluke DSX series, permanent link adapter. Calibration certificate and adapter test count supplied with the pack. Native tester file plus PDF.
Why this matters commercially
Where your building falls within the higher-risk regime under the Building Safety Act 2022, this pack is produced in a form that hands straight into the golden thread of information — a legal duty since April 2024. Retrofitting that evidence after completion costs multiples of collecting it as you go.
Most cabling delays are not cabling delays. They are containment not ready, fire stopping not signed off, a cabinet supply not energised, or a specialist system arriving from a fourth subcontractor with its own programme. Data Cablers sits inside a group that holds those disciplines directly, so the dependency chain is internal and the accountability is single.
Electrical
NICEIC-certified electrical contracting
Containment, tray and basket, fire stopping, cabinet supplies, sub-mains, distribution, EICR and remedial works. Delivered by the group's own electrical teams to BS 7671:2018+A4:2026, on the same order and the same programme as the cabling.
Cabinets & power
Comms cabinets, UPS & power supplies
Wall-mounted and floor-standing comms cabinets supplied and installed, with the dedicated circuits, distribution, PDU and uninterruptible power supply to match. UPS topology classified to BS EN IEC 62040-3 and autonomy sized from the measured load.
Meeting rooms, boardrooms, digital signage and AV systems designed to the published AVIXA standards and installed on cabling, containment and power we put in ourselves — so the room is designed from the outlet outwards.
Where the network carries life-safety and security systems, the group installs and maintains them too — so the cabling design, the containment and the end system are specified together rather than reconciled afterwards.
Energy
EV charging, solar PV & metering
Estate infrastructure programmes rarely stop at data. Where EV, PV or sub-metering forms part of the same building works, it is scoped, priced and delivered by the same group under one commercial relationship.
Why it matters
The interface risk sits with us
When containment, fire stopping, cabinets, power, cabling and AV sit on one order, a delay in any one of them is our problem to solve rather than yours to arbitrate. That is the whole commercial proposition, and it is why clients who meet us on a single job retain us for the estate.
Priced proposal and RAMS issued within two working days of survey.
100%Link certification
Every link tested and certified. Never a sample, whatever the order size.
Sector experience
Different buildings. The same discipline.
Global retail, fashion, the City, the classroom and the data hall. If the infrastructure carries the client's business, it is tested and it is documented — and the standard does not move because the building changed.
Global retail & logistics
Amazon
High-bay warehouse and fulfilment environments. Scanners, VoIP and wireless coverage where steel racking eats signal and survey assumptions fail.
Fashion & retail
Calvin Klein
Store and head office fit-outs delivered to brand fit-out programmes, out of hours, with zero trading disruption and no derogation from the brand standard.
Financial services
Banks & finance houses
Trading floors, dealing rooms and back office. Screened cabling, strict segregation, controlled change and a full audit trail against the change record.
Channel
Large IT providers
We deliver the physical layer so the integrator delivers the platform. White label, badged, and issued on the partner's own paperwork.
Education
Schools & academies
Whole-school rewires and Wi-Fi refreshes inside six-week holiday windows. DBS-checked engineers, safeguarding aware, programme fixed to the term date.
Colocation
Data centres
Cabinet builds, cross connects, pre-terminated trunk, cold aisle containment and phased live migration with a rollback position at every stage.
Housing & public sector
Housing associations
Scheme-wide infrastructure delivered alongside the group's warden call, fire and CCTV teams. One contractor, one programme, one set of records.
Industrial & distribution
Distribution centres
Fibre backbone across the shed, hardened outlets, dock-level connectivity and full-site wireless validation against the racking as built.
Add us to your tender listClient references available on request. Names identify sectors and programmes worked in; no endorsement is implied.
Group accreditationsNICEICCHASSafeContractorConstructionline GoldTrustMarkECAMCSRECC
Held at group level by The Specialist Electrical Group Limited. Current scope certificates, insurance schedule and PQQ pack issued on request — normally within one working day.
Where we work
St Albans out.
Based at SEG House in Chiswell Green, minutes from junction 21A of the M25 and twenty minutes into St Pancras. That places engineers on most London and Hertfordshire sites inside the hour, which is why we can carry reactive obligations as well as project work. Data centre and rollout programmes are delivered nationwide.
* Indicative service statements. Free survey and design, quotation and RAMS turnaround, out-of-hours availability and warranty availability apply within our normal operating area and are subject to survey findings, site access and our standard terms and conditions of sale. They are not a contractual commitment unless confirmed in writing.
