Page 117 - E24 Electrical Notebook

Structured Wiring Specification / BS 8488 / BS 61535 - 113

Typical Structured Wiring Specification

Armoured & Unarmoured Systems

General: System: Unarmoured
A prefabricated wiring system shall be utilised for the distribution of lighting The structured wiring system shall comprise of LSOH flexible cable
and power circuits. assemblies, steel enclosures (MDBs) and polyamide enclosures.
The structured wiring system is rated at 230V/20A.
The system shall offer a high degree of flexibility comprising modular sub
circuit distribution, which is entirely prefabricated off site. Connector System:
The connector system used throughout the entire structured wiring system
The system will provide a complete installation from the respective shall incorporate a connector system manufactured and tested in
distribution board to the furthest point of a circuit. accordance with BS EN 61535: Installation Couplers Intended for
Permanent Connection. Connectors shall be 3, 4, 5 or 6 pole type and have
The wiring components for lighting and power systems shall be colour fully shrouded female (live) contacts.
coded and polarised in such a way that one system shall not plug into the
components of the other systems. RST Specification IP66 / IP68

The connector used throughout the prefabricated wiring system must be RST 20i2/i3 RST 25i3 RST 20i4/i5 RST 25i5
manufactured and tested in accordance with BS EN 61535 - Installation 250 V 250 V
Couplers Intended for Permanent Connection. 20 A 25 A
3 Pole
System: Armoured Rated Voltage 2 or 3 Pole 250/400 V 250/400 V
Unused connectors shall have fully shrouded (live) contacts. Rated Current
The connector system may only be disconnected by means of a key or tool. Number of Poles 20 A 25 A (L,N) 1 -
The system comprises 6491B LSOH BS 7211 cables enclosed with a metal Contacts (1,2) 10
flexible conduit.
Connectors will be rated at 20A for Lighting and 32A for Radial Power. A
The connector system shall be circular to allow for ease of installation
through fire barriers and stud walls. 4 or 5 Pole 5 Pole
The cable termination of the connectors should be screwless type therefore
maintenance free during the life of the installation. Ambient Operating Connectors 55ºC 55ºC 55ºC 55ºC
The system and all components must meet the relevant British and Temperature Distributor 40ºC
European Standards for Prefabricated Wiring Systems - BS 8488 Part 1. Under Full Load

Temperature Range: 40ºC to +100ºC

System Components: Material: Contact parts: brass. Surface-plated housing
Regulations: parts: thermoplastic material PA66, halogen-
The principal components of the structured wiring system is as follows: Approvals: free, V2 sealing material: NBR.

• Home Run Cable • Master Distribution Box (MDB) DIN VDE 0606 T200, DIN EN 61984 (VDE
627), VDE 0110 IEC 60999: UL 2238 CSA:
• Extender Cable • Fused Spur Unit C22.2 No.182.2-M1987; LR Type Approval
System.
• T Connector • Switch Module
Pending VDE; UL; CSA; LR; GL; DNV.
Home Run Cables:
Home run cables comprising 2.5mm², 4.0mm² or 6.0mm² LSOH singles Degree of Protection: IP65, IP66, IP67 and IP68 (3m; 2 hours).
(number dependant on number of circuits) in metal flexible conduit (up to
40mm diameter) complete with gland and lock-nut. Glow-Wire Test 850ºC, 30s: For connectors, distribution units, cable
assemblies and appliance couplers.
If the structured wiring system is to be integrated with a lighting or BMS
control system, the home run cable generally comprises a Belden type 8719 Coding: Mechanical coding symbolised by colour
fieldbus cable or DALI control pairs. These are to be run internally of the code. Grey and black with the same
conduit with the power conductors, not separately. mechanical coding. Other codings are
available.
Length of the home run cable will be determined by position on site and
can be supplied pluggable for direct interface with the Distribution Board.

Master Distribution Boxes (MDBs): Note: Protection against shock generally
MDBs generally comprising a solid galvanized steel enclosure with a guaranteed even when disconnected.
removable lid and provision for earthing. Protective conductor leading. Connection to
the live cable must be made with a female
Output ports shall be positioned around perimeter of the MDB. Number of connector according to the regulations. It is
outputs will be determined by the project by standard configurations of 6 or therefore not possible to have a ring circuit
9 port/circuit. arrangement. Only pluggable in the correct
pole configuration: one pole cannot be
Extender Cable: connected. Contacts protected against
Extender cable assemblies of up to 4.0mm² LSOH singles in a metal flexible strain on the cable. All components can be
conduit and pre-wired male and female. interlocked. DIN VDE 0606 T200 requires
the use of a locking device. Dangerous
Fused Connection Units: mismating with installation connector
Fused connection units (for connection to fan-coils or similar loads) systems of other suppliers is not
comprising male and female connectors, suitable rated switch and fuse and automatically excluded by compliance with
provision for earthing. DIN VDE 0606 T200. Installation connectors
do not replace national connector/outlet
T Connector: systems for home applications.
The T connector comprising 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.

Wieland Electric Limited Tel : 01483 456270
Riverside Business Centre Fax : 01483 569783
Walnut Tree Close sales.uk@wieland-electric.com
Guildford www.wieland.co.uk
Surrey GU1 4UG www.wielandmetalynx.co.uk