The lighting trunking in ratings of 25A and 40A shall be designed and manufactured to comply with IEC 60439-2 and BS EN 60439-2 standards and suitable for use at 415V 3 phase 50Hz.

The trunking will comply to a degree of protection IP41, as defined in IEC 60529 and BS 60439-2 and capable of advanced level of protection to IP55.

The trunking casing shall be manufactured from extruded aluminium section and be available in 3 metre, 2 metre and 1 metre lengths with tapping outlets every 1 metre along its length on one side. Jointing of the lengths shall be by a combined mechanical and electrical ridged jointing piece retained by a spring clip and screw. The casing will provide the protective conductor.

The phase and neutral conductors (4 pole or 6 pole) shall be copper of a suitable size for given 25A and 40A ratings and the same cross-sectional area. They shall be fully insulated and supported throughout the length of the trunking. The tap-off outlets shall have protective covers to prevent accidental contact with live conductors.

Fixing brackets shall be supplied, suitable for suspension wall mounting of trunking at given intervals.

Tapping Units
Tap-off units shall be plug-in type and shall provide suitable protection during connection and disconnection. They shall be supplied either pre-wired or with terminals for direct connection and fuse rated up to 6A.

The busbar trunking system shall be Mempower LUX Range or equal and approved.

The busbar trunking in ratings from 40 Amp - 125 Amp, shall be of approved manufacture, designed for use as a power distribution system for both commercial and industrial applications. Current ratings shall be as detailed on the drawings/schedules and comply to a degree of protection IP4X, as defined in IEC 60529 (BS EN 60529) and capable of an advanced level of protection to IP54.

The busbar trunking system shall be designed and manufactured to comply fully with IEC 60439-2 and BS EN 60439-2 standards and suitable for use in a 415V, 3 phase, 4 wire, 50Hz supply. The busbar trunking shall be ASTA certified and capable of withstanding prospective fault level currents as detailed on the drawings / schedules.

The enclosure shall be manufactured from shaped extruded aluminium profile with interlocking covers manufactured from fire retardent plastic, flammability grade UL94V-O. The busbar trunking shall be available in 3m or 2m lengths with tapping outlets every third of a metre along its length. Each length shall be complete with mechanical coupling and bolted electrical joints.

The conductor bars shall be square or rectangular hard drawn high conductivity copper as specified in the drawings/schedules and shall compise 5 (five) conductors, one of which will be an integral earth conductor and not rely on the busbar trunking case for earth continuity.

Fire resisting barriers shall be provided within the trunking where the enclosure passes through fire-rated floor or wall positions. The fire barriers shall be manufactured from approved intumescent gasket material in order to form a barrier not less than 125mm thick.

Power tap-off points shall be provided at 333mm intervals on one side of the trunking and shall be fully shrouded by automatic shutters ('finger safe") to prevent accidental contact with live parts. The shutters shall be operated by inserting and removing the tap-off units.

When a change of direction occurs in a busbar run, manufacturers purpose made fittings shall be used, especially flexible elements to take up elevations in building walls etc.

Fixing brackets shall be supplied by the manufacturer for suspension or wall mounting at a distance of 1.5 metres unless stated differently in the drawings/schedules.

Tapping Boxes
Tapping boxes shall be "plug-in" type fitted with HRC fuses, MCB's, RCB's, or socket outlets (BS 1363 or BS 4343) as detailed on the drawings / specifications. The tapping boxes shall be designed and manufactured so that the current carrying metal is not exposed during insertion or removal, and the unit is connected to earth before contact is made with the live busbar conductors. The unit shall remain earthed during removal until all live connections are disconnected.

The tapping box enclosures shall be manufactured from reinforced polyester, classified flammability grade UL94V-O. A safety device shall be fitted to ensure non-reversibility when connecting to the busbar.

The busbar trunking system shall be Mempower Low Power Range or equal and approved.

The busbar trunking in ratings from 125 Amp -630 Amp, shall be of approved manufacture, designed for use as a rising main and horizontal power distribution system for both commercial and industrial applications. Current ratings shall be as detailed on the drawings / schedules and comply to a degree of protection IP41, as defined in IEC 60529 (BS EN 60529) and capable of an advanced level of protection to IP54.

The busbar trunking system shall be designed and manufactured to comply fully with IEC 60439-2 and BS EN 60439-2 standards and suitable for use in a 415V, 3 phase, 4 wire, 50Hz supply. The busbar trunking shall be ASTA certified and capable of withstanding prospective fault level currents as detailed on the drawings / schedules.

The enclosure shall be manufactured from shaped extruded aluminium profile with interlocking flame retardant polyester covers. The busbar trunking shall be available in 3m or 2m lengths with tapping outlets every third of a metre along its length. Each length shall be complete with mechanical coupling in order to provide a quality electro-mechanical joint.

The conductor bars shall be square or rectangular hard drawn high conductivity copper as specified in the drawings / schedules and shall comprise 5 (five) conductors, one of which will be an integral earth conductor and not rely on the busbar trunking case for earth continuity.

Fire resisting barriers shall be provided within the trunking where the enclosure passes through fire-rated floor or wall positions. The fire barriers shall be manufactured from approved intumescent gasket material in order to form a barrier not less than 125mm thick.

Power tap-off points shall be provided at 333mm intervals on one side of the trunking and shall be fully shrouded by automatic shutters ("finger safe") to prevent accidental contact with live parts. The shutters shall be operated by inserting and removing the tap-off units.

When a change of direction occurs in a busbar run, manufacturers purpose made fittings shall be used. Fixing brackets shall be supplied by the manufacturer for suspension or wall mounting at a distance of 1 .5 metres unless stated differently in the drawings / schedules.

Tapping Boxes
Tapping boxes shall be "plug-in" type fitted with HRC fuses, MCB's, MCCB's, switch fuses, fuse combination units or socket outlets (BS 4343) as detailed on the drawings / specifications.

The tapping boxes shall be designed and manufactured so that the current carrying metal is not exposed during insertion or removal, and the unit is connected to earth before contact is made with the line busbar conductors. The unit shall remain earthed during removal until all live connections are disconnected.

The tapping box enclosures shall be manufactured from 1.5mm sheet steel, with paint finish to light grey. Tapping boxes shall be provided complete with integral flexible cables terminating in a purpose made shrouded copper connection, silver plated plugs for attachment to the busbar without drilling or clamping.

A safety device shall be fitted to ensure non-reversibility when connecting to the busbar.

The busbar trunking system shall be Mempower Medium Power Range or equal and approved.

Typical Specification

Enclosure
The system shall be designed and manufactured in accordance with the following standards:

• BS EN 60439-1
• BS EN 60439-2

The system shall be supplied as factory assembled units, which are rigid in construction and symmetrical in appearance.

Trunking section ends shall be asymmetrical in order to prohibit phase reversal of adjacent sections. The joint between adjacent trunking lengths shall be formed by overlapping the conductors or by a removable joint stack. Insulator plates shall be provided within the joint to isolate each phase conductor joint. The integral joint and busbar construction shall form a combined structure sufficiently rigid to be supported on 3 metre centres. Deforming the busbar casing shall not compromise joint integrity. The busbar casing shall have no ventilating openings. Horizontal or vertical hangers shall be provided as required. Feeder, Distribution and Rising Mains sections shall be interchangeable.

The tap-off outlet shall have an integral shutter that will automatically open upon fitting of a tapping unit.

Tap-off outlets shall be located every 500mm and on both sides of the Distribution trunking. Tap-off outlets shall be located on one side every 500mm along the Rising Mains trunking.

It shall be possible to position tap-off outlets to the customers specification. Tap-off outlets shall meet lEC IP4X requirements without the need for an additional cover. Tap-off outlets will also have the option to up grade the P level to IP54.

The housing shall be of extruded aluminium section custom designed for the system. All additional fixings and fittings shall be plated for corrosion resistance.

The bus bar shall be suitable for the following uses:

• IP4X Feeder/Distribution
• IP54 Feeder/Distribution

The maximum operating temperature shall comply with IEC 60439-2 in any position at its rated amperage and P level of protection.

Joints
Electrical joints shall be accomplished through a single bolt-type-joint stack. A two-headed joint bolt shall be utilised to provide a one-time torque indication on installation. The joint bolt shall provide an easily detected visual indication that the bolt has been tightened to the specified torque.

Inspection covers shall be provided to permit periodic joint examination without disturbing joint pressure or reducing the busbars ability to be supported on 3 metre centres. It shall be possible to remove a section of busbar without disturbing adjacent sections.

Disc spring washers shall be used at the joint to uniformly distribute pressure. The disc spring washers shall also accommodate the thermal expansion of the busbars and housing at this position.

Busbars
Busbars shall be fabricated from electrical grade:

• Copper (C101 BS 1432/1433)
• Plated bars can be provided where specification requires.

The busbars shall be capable of withstanding the stress of a RMS symmetrical ampere fault for a 1-second duration.

Busbars shall be insulated with a 130°C (Class B material) Polyester Film insulation except at joints and tap-off positions. The construction shall ensure that busbar spacing is held to a minimum reducing reactance.

The design of the system will ensure that differential expansion between adjacent bars, or between bars and casing is accommodated within the length. The aluminium housing shall serve as an integral earth conductor.

Optional: a 200% rated neutral shall be provided which is entirely contained within the busbar housing.

Optional: a 100% rated earth bar shall be provided which is entirely contained within the busbar housing.

Optional: a 100% rated isolated earth (clean earth) shall be provided which is entirely contained within the busbar housing.

Tapping Units
Tapping units shall be:

• Circuit breaker (Current Limiting)
• Fuse-Switch Disconnector
• Fused

Description and ratings are shown on the drawings.

Fuse switch tapping units shall contain double break switch disconnector conforming to BS EN 60947-3 and suitably equipped to accept fuse links. The tap-off units will have an interlocked door with suitable rotary operating mechanism.

Fuse tapping units shall contain three fuse carriers suitable rated to accept fuse links.

Tapping units would be designed so that earthing connections are engaged before phase connections when installing a unit. Tapping units shall be designed so that all accessories required to attach the unit to the trunking are captive. Tapping units shall be of the safety type, so interlocked with the trunking housing that they cannot be added or removed unless the switching mechanism is "OFF".

Tapping units shall be equipped with highly visible red/green indicator to indicate "ON/OFF" position of the switching mechanism. The "ON/OFF" indicator shall also use the international symbols for identifying "ON" (I) 'OFF"
(0).

The Busbar Trunking shall be MEMPOWER XP Low Impedance Busbar Trunking.