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Wieland Electric - Structured Wiring Specification / BS 8488 / BS 61535

Armoured Systems - Unarmoured - T Connector - Home Run Cables - Master Distribution Boxes - Fused Connection Units

Typical Structured Wiring Specification

Armoured & Unarmoured Systems


A prefabricated wiring system shall be utilised for the distribution of lighting and power circuits.

The system shall offer a high degree of flexibility and comprise modular subcircuit distribution, which is entirely prefabricated off-site.

The system will provide a complete installation from the respective distribution board to the furthest point of a circuit.

The wiring components for lighting and power systems shall be colour coded and polarised in such a way that one system shall not plug into the components of the other systems.

The connector used throughout the prefabricated wiring system must be manufactured and tested in accordance with BS EN 61535 - Installation Couplers Intended for Permanent Connection.

System: Armoured

Unused connectors shall have fully shrouded (live) contacts.

The connector system may only be disconnected by means of a key or tool.

The system shall comprise 6491B LSOH BS 7211 cables enclosed with a metal flexible conduit.

Connectors will be rated at 20A for Lighting and 32A for Radial Power.

The connector system shall be circular to allow for ease of installation through fire barriers and stud walls.

The cable termination of the connectors should be screwless and therefore maintenance free during the life of the installation.

The system and all components must meet the relevant British and European Standards for Prefabricated Wiring Systems - BS 8488 Part 1.

System Components:
The principal components of the structured wiring system shall be as follows:

  • Home Run Cable
  • Extender Cable
  • T Connector
  • Master Distribution Box (MDB)
  • Fused Spur Unit
  • Switch Module

Home Run Cables:
Home run cables comprising of 2.5mm², 4.0mm² or 6.0mm² LSOH singles (number dependent on number of circuits) in metal flexible conduit (up to 40mm diameter) complete with gland and lock-nut.

If the structured wiring system is to be integrated with a lighting or BMS control system the home run cable will generally comprise of a Belden type 8719 fieldbus cable or DALI control pairs. These are to be run internally off the conduit with the power conductors, not separately.

Length of the home run cable will be determined by position on site. This cable can be supplied pluggable for direct interface with the Distribution Board.

Master Distribution Boxes (MDBs):
MDBs generally comprising of a solid galvanised steel enclosure with a removable lid and provision for earthing.

Output ports shall be positioned around the perimeter of the MDB. Number of outputs will be determined by the project by standard configurations of 6 or 9 port/circuit.

Extender Cable:
Extender cable assemblies of up to 4.0mm² LSOH singles in a metal flexible conduit and pre-wired male and female connectors.

Fused Connection Units:
Fused connection units (for connection to fan-coils or similar loads) shall comprise of male and female connectors, suitable rated switch and fuse and provision for earthing.

T Connector:
The T connector comprising of male and female connectors and tails, flex or conduit drop lead for connection to luminaire/lighting control module LCM/fan coil unit FCU variable air volume unit (VAV).

Switch Module:
Switch modules shall allow for a local switch within the system. This can control 1-way, 2-way, intermediate, PIR or dimming switching requirements.

System: Unarmoured

The structured wiring system shall comprise of LSOH flexible cable assemblies, steel enclosures (MDBs) and polyamide enclosures. The structured wiring system is rated at 230V/20A.

Connector System:
The connector system used throughout the entire structured wiring system shall incorporate a connector system manufactured and tested in accordance with BS EN 61535 - Installation Couplers intended for Permanent Connection. Connectors shall be 3, 4, 5 or 6-pole type and have fully shrouded female (live) contacts.

Temperature Range:
-40°C to +100°C

Contact parts: brass.
Surface-plated housing parts: thermoplastic material PA 66, halogen-free, V2 sealing material: NBR.

DIN VDE 0606 T200, DIN EN 61984 (VDE 627), VDE 0110 IEC 60999: UL 2238 CSA: C22.2 No. 182.2-M1987; LR Type Approval System.

Pending VDE; UL; CSA; LR; GL; DNV.

Degree of Protection:
IP65, IP66, IP67 and IP68 (3m; 2 hours).

Glow-Wire Test 850°C, 30s:
For connectors, distribution units, cable assemblies and appliance couplers.

Mechanical coding symbolised by colour code.
Grey and black with the same mechanical coding. Other codings are available.

Protection against shock generally guaranteed even when disconnected. Protective conductor leading. Connection to the live cable must be made with a female connector according to the regulations. It is therefore not possible to have a ring circuit arrangement. Only pluggable in the correct pole configuration: one pole cannot be connected. Contacts protected against strain on the cable. All components can be interlocked. DIN VDE 0606 T200 requires the use of a locking device. Dangerous mismating with installation connector systems of other suppliers is not automatically excluded by compliance with DIN VDE 0606 T200. Installation connectors do not replace national connector/outlet systems for home applications.

Click the PDF image to view the technical information in full

Structured Cabling / Modular Wiring

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Wieland Electric Limited
Ash House
Tanshire Park
Shackleford Road

Tel: 01483 456270
Fax: 01483 505029.

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