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 sub circuit 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 BSEN 61535 - Installation couplers intended for permanent connection.
Unused connectors shall have fully shrouded (live) pins.
The connector system shall only be able to be disconnected by means of a specialist tool.
The system shall comprise 6491B LSOH BS7211 cables enclosed within 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 with the connectors should be screwless type therefore maintenance free during the life of the installation.
The principal components of the prefabricated wiring system shall be as follows:
- Home Run
- Master Distribution Box (MDB)
- Extender Cable
- Fused Spur Unit
- T Connector
- Switch Module
Home run cables comprising of 2.5mm2, 4.0mm2 or 6.0mm2 LSOH singles (number dependant 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 of 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 Box (MDB)
MDB's generally comprising of a solid galvanized steel enclosure with a removable lid and provision for earthing. Output ports shall be positioned around perimeter of the MDB. Number of outputs will be determined by the project by standard configurations of 6 or 9 port/circuit.
Extender cable assemblies of up to 4.0mm2 LSOH singles in a metal flexible conduit (16 mm diameter) and pre-wired male and female.
Fused Connection Unit
Fused connection units (for connection to fan-coils or similar loads) shall comprise of male and female connectors, suitably rated switch and fuse and provision for earthing. A 1m flex will carry the load to the equipment.
The T connector comprise of male and female connectors and tails, flex or flexible 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.
Architects and electrical engineers require computer-aided planning tools, especially when reliable information regarding project scope, schedule and cost estimations is required in advance.
For the planning of pluggable electrical installations with gesis® Wieland Electric offers its gesis® PLAN software. The planning tool uses the CAD building data to generate installation layouts, as well as bills of material and price lists.
Furthermore, gesis® PLAN automatically checks the current carrying capability of the cables and detects any errors. The designer can locate them immediately in the detailed 3D views.
The software is available free of charge at firstname.lastname@example.org