Low-voltage switchgear
5.5.1 Planning Notes for Low-voltage Switchgear
Installation – clearances and corridor widths
The minimum clearances between switchgear and obsta-cles specified by the manufacturer must be taken into account when installing low-voltage switchgear (Fig. 55/2). The minimum dimensions for operating and servicing corridors according to VDE 0100 Part 729 (IEC 60364-7-729 Draft) must be taken into account when planning the space requirements (Table 55/1, Fig. 55/3, Fig. 55/4).
Caution! If a lift truck is used to insert circuit-breakers or withdrawable units, the minimum corridor widths must be adapted to the lift truck!
Transportation units
Depending on the access routes available in the building, one or more panels can be combined into transportation units (TU). The max. length of a TU should not exceed 2,400 mm. The transportation unit length results from the sum of the panel widths per TU + 200 mm (230 mm), however at least 1,400 mm (1,430 mm).
The dimensions for the transportation unit heights result from the switchgear height plus 190 mm for the transport base.
The relevant depth of a transportation unit depends on the depth of the switchgear.
* Values in brackets = export packaging for shipping by sea
Weights
The panel weights as listed in Table 55/2 (Page 84) should be used for the transportation and dimensioning of build-ing structures such as cable basements and false floors.
Table 55/1: SIVACON S8 switchgear dimensions Space requirements
Height: 2,000 mm and 2,200 mm
(optionally with 100 mm or 200 mm base) Width: For data required for the addition of panels please
refer to the panel descriptions Depth:
Busbar position Rated current of the main busbar Type of installation Cable / busbar entry
600 mm Rear 4,000 A Single front Top & bottom 800 mm Rear 7,010 A Single front Top & bottom 1,000 mm Rear 4,000 A Double front Top & bottom 1,200 mm Rear 7,010 A Double front Top & bottom
500 mm Top 3,270 A Single front Bottom 800 mm Top 6,300 A Single front Bottom 1,200 mm Top 3,270 A Single front Top & bottom Manufacturer e. g. Kaiser + Kraft
Dimensions of the lift truck
Height 2,000 mm
Width 680 mm
Depth 920 mm
Minimum corridor width about 1,500 mm
Fig. 55/2: Clearances to obstacles Front Front
Front
A: 100 mm from the rear side of the installation B: 100 mm from the side side panels
C: 200 mm from the rear panels with back to back installation B
C
B
A
Depth Transportation unit depth
500 mm 1,050 mm (1,060 mm*)
600 mm 1,050 mm (1,060 mm*)
800 mm 1,050 mm (1,060 mm*)
1,000 mm 1,460 mm (1,490 mm*)
1,200 mm 1,660 mm (1,690 mm*)
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Double-front installations
In the double-front installation, the panels are positioned in a row next to and behind one another. The main advan-tage of a double-front installation is the extremely eco-nomic design through the supply of the branch circuits on both operating panels from one main busbar system.
The "double-front unit" system structure is required for the assignment of certain modules.
A double-front unit (Fig. 55/5) consists of at least 2 and a maximum of 4 panels. The width of the double-front unit is determined by the widest panel (1) within the double-front unit. This panel can be placed on the front or rear side of the double-front unit. Up to three panels (2), (3), (4) can be placed on the opposite side. The sum of the panel widths (2) to (4) must be equal to the width of the widest panel (1). The panel combination within the double-front unit is possible for all technical installations with the following exceptions.
Exceptions
The following panels determine the width of the double-front unit and may only be combined with an empty panel.
.
Bus sectionalizer unit.
5,000 A incoming / outgoing feeder.
6,300 A incoming / outgoing feeder Environmental conditions for switchgearThe climate and other external conditions (natural foreign substances, chemically active pollutants, small animals) may affect the switchgear to a varying extent. The effect depends on the heating / air-conditioning systems of the switchgear room. If higher concentrations are present, pollutant-reducing measures are required, for example:
.
Air-intake for operating room from a less contaminated point.
Slightly pressurizing the operating room (e.g. by blowing uncontaminated air into the switchgear).
Switchgear room air conditioning (temperature reduction, relative humidity< 60 %, if necessary, use air filters).
Reduction of temperature rise (oversizing of switchgear or components such as busbars and distribution bars) Power lossesThe power losses listed in Table 55/3 (Page 84) are approxi-mate values for a panel with the main circuit of functional units to determine the power loss to be discharged from the switchgear room.
Fig. 55/3: Reduced corridor widths within the area of open doors
1) Minimum height of passage under covers or enclosures 600
Fig. 55/4: Minimum corridor width according to VDE 0100 Part 729 Min. free passage
1) With switchgear fronts facing each other, the space requirements only account for obstruction by open doors from one side (i.e. doors that don’t close in escape direction)
2) Take door widths into account, i.e. door can be opened at 90 ° minimum Full door opening angle = 125 ° (Sinus 55 °)
Fig. 55/5: Panel arrangement of double-front installations Double-front units
Double-front installations – top view
Double-front installations only with main busbar system at the rear
(1)
(3)
(2) (4)
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Table 55/3: Power loss generated per panel (average values)
Circuit-breaker type Approx. Pv [W] for % of the rated current of the switch
100 % 80 %
3WL1106 1,600 A Size I 1,000 640
3WL1106 2,000 A Size II 1,140 740
3WL1106 2,500 A Size II 1,890 1,210
3WL1106 3,200 A Size II 3,680 2,500
3WL1106 4,000 A Size III 4,260 2,720
3WL1108 5,000 A Size III 5,670 3,630
3WL1106 6,300 A Size III 8,150 5,220
Universal mounting design panel (incl. withdrawable units, fixed mounting with front doors) 600 W
3NJ4 in-line-type switch-disconnector panel (fixed mounting) 600 W
3NJ6 in-line-type switch-disconnector design panel (plugged) 1,500 W
Fixed-mounted type panel with front covers 600 W
Reactive power compensation panel non-choked choked
1.4 W / kvar 6.0 W / kvar Table 55/2: Average weights of the panels including busbar (without cable)
Rated current [A]
4,000–6,300 Size III 800 1,000 915
Universal mounting design panel
(incl. withdrawable units, fixed mounting with front doors)
500 3NJ4 in-line-type switch-disconnector panel (fixed mounting) 600
800
600 800
360 470
3NJ6 in-line-type switch-disconnector design panel (plugged)
500