Nickel-plated and tin-plated aluminum and tin-plated copper sections are used for power conveyance.

The low inherent impedance and large surface area of the busbars limit the heat build-up.

The result is a low transmission loss and a low voltage drop.

Enclosures

The enclosure is made of hot galvanized steel with a paint finish. Color: RAL 7035 (light gray).

Degree of protection: IP52 as basic equipment. This can be increased to IP54 or IP55 with additional parts.

BD2A-2, BD2C-2 trunking units

BD2A-3, BD2C-3 trunking units, junction units, BD2A-..., BD2C-... feeder units

Tap-off points

The busbar support and outgoing point form a unit.

The leading/delayed PE contact at the outgoing unit provides positive opening or closing of the outgoing point.

The outgoing point can be coded at the factory on request, together with the outgoing unit. The outgoing point is sealable.

BD2-AK1, BD2-AK2(3), BD2-AK02(03) and BD2-AK04... outgoing units are plug-in types for all systems,
BD2-AK05(06)... outgoing units are only for systems from 630 A.

Left: Tap-off point for BD2.-160 to BD2.-400 Right: Outgoing point for BD2.-630 to BD2.-1250

Connection system

Trunking units are connected quickly and securely via the joint block.

Left: Flange cover Right: Joint blocks

Joint blocks

Features:

• Even holding pressure ensures completely secure connection of all five busbars. Fast mounting up to 1250 A with single-bolt terminal.
• The built-in expansion compensation absorbs the heat expansion of the busbars.
• The terminal can be tightened using conventional tools.
• Two sizes are available for the whole system.
• The joint block is supplied as an integral part of the trunking units and junction units.

Left: BD2-400-EK for 160 to 400 A Right: BD2-1250-EK for 630 to 1250 A

Mechanical connection with the enclosure is made over 4 screws.

Straight trunking units

Features

The trunking units are available in the following versions:

• Without outgoing points
• With outgoing points on two sides at intervals of 0.5 m, offset by 0.25 m (BD2.-2, BD2.-3)

One joint block is included in scope of supply.

Fire protection possible (see "Fire protection").

The following lengths are available:

• 3.25 m
• 2.25 m
• 1.25 m
• Selectable lengths from 0.5 m to 3.24 m
• Lengths that can be adjusted by the customer 1.25 m, can be shortened to 0.5 m (full cross-section for N and PE, without tap-off points).

Number of tap-off points

On optional lengths, it may not be possible to fit outgoing units to all outgoing points.

Fire protection

If the busbar trunking system is routed through a fire wall or ceiling, fire protection must be fitted. Depending on the customers requirements, Siemens offers fire protection with a fire resistance rating of S90 and S120.

Standard lengths, optional lengths and junction units are supplied with fire protection depending on the ordering data (see Configuration "Fire Protection" upon request).

Factory-fitted equipment:

• Internal fire protection.
• External fire protection, if required.
• Documentation (certificate of approval, wall-mounted signs and declaration of conformity),
  for Germany as separate kit BD2-S90-ZUL-D or BD2-S120-ZUL-D

Mineral-based mortar or fire protection mass (configuration "fire protection" on request) to seal any gaps between busbar trunking element and component must be provided at the customer's site.

Fire protection for trunking units and junction units

Fire protection: Fire protection class EI90 and EI120 in accordance with EN 1366-3 and approval papers for European standard in preparation.