Technical Data

MDmax ST Technical Data

Design of switchgear--Structural design.

Enclosure

Functional compartments of switch cabinet

The switch cabinet is divided into four parts:

· Busbar room

· Functional unit room

· Cable room

· Secondary control line horizontal wiring room

Rear outlet

· Busbar room

· Functional unit room

· Cable room

· Secondary control line horizontal connection room

Skeleton

Dimensions of switchgear (mm)

Frame Structure: The MDmax ST frame adopts a self-supporting frame structure, which is assembled from double-flanged G-shaped or C-shaped profiles. Modular holes are arranged at 25mm intervals on the skeleton, making the cabinet frame easy to assemble and extremely sturdy. The entire frame is precisely connected by horizontal and vertical bolts, and the frame structure requires no maintenance. The skeleton, partitions, and mounting plates are all made of aluminum-zinc coated steel sheets.

Columns

Enclosure: The enclosure of the MDmax ST switchgear is made of steel sheets covered with electroplating and powder coatings, ensuring high durability. The door panels, top plate, rear plate, partitions, and side plates are installed with self-tapping screws, and the final cabinet structure is determined by the requirements of the protection level. Based on the requirements of the conventional safety system, for separate door panels are required to be installed in the compartments or spaces for commissioning, operation, and maintenance.

Design of Switchgear Structural Design - Busbar System

Main Busbar

Main Busbar

The main busbar is arranged at the top of the switchgear (in the busbar compartment), and the busbar material is copper (Cu). For each phase, single-piece, double-piece, triple-piece, or quadruple-piece can be selected according to the current rating, and the space of the busbar sub - compartment can be expanded as needed. To facilitate the on - site installation of the busbar at the construction site, the top cover of the busbar compartment is detachable.

The main busbar system installed at the top of the switchgear is completely separated from the functional unit area, cable area, and secondary wiring horizontal connection area, ensuring a sufficient safety distance between the busbar and the operation and maintenance personnel.

According to DIN40500, the busbar system and all related components are made of copper. In addition to bare copper, the busbar can also be tin - plated or fully insulated with heat - shrinkable sleeves as required.

Grounding Protection Bar and Neutral Bar

Grounding Protection Bar and Neutral Bar

The grounding protection bar and neutral bar are installed below the switchgear. The PE bar is fixed on the frame to ensure electrical continuity.

In some applications, due to phase imbalance or the presence of harmonics, when the neutral bar needs to reach 50% or 100% of the phase line, or when the incoming line switch is a 4 - pole switch, the neutral bar can be placed in the main busbar area parallel to the main busbar.

Distribution Busbar

Distribution Busbar

The 3 - pole or 4 - pole distribution busbar system can be centrally arranged, and the standard for the distribution busbar is nickel - plated copper.

Power distribution busbar cover

Power distribution busbar cover

The power distribution busbar cover with ventilation holes can be independently disassembled at the back of the cabinet, which facilitates heat dissipation, thereby improving the current - carrying effect and also facilitating regular inspection and maintenance. The busbar can also be replaced when necessary to increase the current - carrying capacity.

Design of switchgear Drawer - type solution - U - shaped Universal drawer - type unit

1/4 unit

This series of drawer - type units is mainly used in industrial applications requiring high reliability. In particular, the drawers of the motor control center (MCC) can be easily replaced during equipment operation, thus ensuring the continuity of electrical equipment.

Small drawer

The small drawer consists of 1/4 units and 1/2 units. A single switchgear can also install a maximum of 36 1/4 units, and the 1/2 unit can accommodate a maximum of 18 units. Simply push the drawer in to achieve an orderly conversion among the three positions of isolation, test, and connection. The indicator window clearly shows the current position status of the drawer.

1/2 unit

Full - width drawer

This series of drawers has five heights: 0.75U/1U/1.5U/2U/3U, and the height of 1U is 200mm. After this series of drawers is pushed into the switchgear unit compartment, insert the rocker and shake it to convert the entire drawer among the three positions of isolation, test, and connection in sequence. The position status of the drawer is clearly shown by the indicator window.

Whether it is manual or electric, there is an interlocking mechanism between the drawer door panel and the switch. That is, regardless of the manual or electric scheme, as long as the drawer is in the connected position, the drawer cannot be moved.

The full - width drawer is directly connected to the vertical busbar through the hinge flap at the front of the vertical busbar cover. The cables of the main circuit and the auxiliary circuit can be connected in the cable chamber.

Full - width drawer

Operation method:

・ Put the drawer into the switchgear unit compartment, insert the rocker into the rocking hole, and turn it clockwise to complete the conversion among the three positions of isolation, test, and connection in sequence. The position indicator window will show the current connection status.

・When the rocker is turned to the connection position, remove the rocker, push the closing button downward to close the rocker hole, and then the main switch can be closed.

・After the main switch is opened, push the closing button upward, insert the rocker, and turn it counter - clockwise to withdraw from the connection, test, and isolation positions in sequence.

・If it is a drawer with an electric operating mechanism and needs to be withdrawn, you must first press the white unlocking button before inserting the rocker and turning it counter - clockwise to remove the drawer.

Design of Switchgear Drawer - type Scheme - Type S Intelligent Drawer - type Unit

1/4 Unit

This series of drawer - type units can be used in industrial applications with high requirements for intelligent control. They can perform real - time monitoring and data collection of electrical equipment in the motor control center (MCC). At the same time, faulty electrical circuits can be easily replaced to ensure the continuous power supply of electrical equipment.

Small Drawers

Small drawers include two specifications: 1/4 unit and 1/2 unit.

The technology of this series of drawers is unique, with a compact design. Up to 36 of the smallest 1/4 units (U) can be installed in the functional area. Therefore, while reducing the overall number of switchgear, the floor area of the switchgear is minimized. This series of drawers consists of fixed parts and movable parts (connectors). After the fixed parts of the drawer are pushed into the small chamber of the switchgear unit, the component door of the small chamber needs to be closed. At this time, insert the rocker, and the movable parts of the drawer can be sequentially switched among the three positions of isolation, test, and connection. The position status of the connector is displayed by the indicator window with an LED.

1/2 Unit

Operation Panel

Operation Method:

1) Press the drawer unlocking button, push the drawer in, and close the component door.

2) Turn the rocker clockwise to complete the three - position conversion from isolation, test, to connection in sequence. The position indicator window will show the current connection status.

3) When the rocker is turned to the connection position, remove the rocker, push the moving button to the left to close the rocker hole, and then the main switch can be closed.

4) After the main switch is opened, push the moving button to the right, insert the rocker, and turn it counter - clockwise to withdraw from the connection, test, and isolation positions in sequence.

5) After opening the unit component door, press the drawer unlocking button to remove the small drawer.

Full-width drawer

Full-width drawer

This series of drawers comes in four heights: 1U/1.5U/2U/3U (U = 200mm). This series of drawers consists of fixed parts and movable parts (connectors). After the fixed part of the drawer is pushed into the switchgear unit compartment, insert the rocker, and the movable part of the drawer can be sequentially switched among the three positions of isolation, test, and connection. The position status of the connector is displayed by the indicator window with an LED.

Whether it is manual or electric, there is a mechanical interlocking mechanism between the drawer door panel and the switch. That is, in both manual and electric schemes, as long as the switch is in the closed position, the drawer component door cannot be opened.

All operations of the drawer do not require opening the door, and the protection level is not lost when performing the three-position conversion.

The full-width drawer is directly connected to the vertical busbar through the hinge flap at the front of the vertical busbar cover. The cables of the main circuit and the auxiliary circuit can be connected in the cable chamber.

Drawer cabinet

The instrument panel can be flipped forward by 90° for easy on-site upgrade and transformation.

Drawer operation method when manually opening and closing the circuit breaker:

1) Open the unit door, push the drawer in along the guide rail, and close the unit door.

2) Press the position operation unlocking button (hereinafter referred to as the unlocking button), turn the rocker clockwise to the test position, and the unlocking button will pop out and reset.

3) Press the unlocking button again, turn the rocker clockwise to the connection position, and the unlocking button will pop out and reset.

4) Remove the rocker, move the unlocking movement button (hereinafter referred to as the movement button) to the left, which will simultaneously close the rocker hole and lock the unlocking button. At this time, the main switch can be closed.

5) After the main switch is opened, move the movement button to the right, press the unlocking button, insert the rocker, and turn it counterclockwise to retreat from the connection position to the test position. The unlocking button will reset and pop out.

6) Press the unlocking button again, turn the rocker counterclockwise. When it reaches the isolation position, the unlocking button will also pop out and reset.

7) Remove the rocker, open the unit door, lift the drawer locking handle upwards, and the drawer can be removed.

Design of Switchgear Drawer Scheme - Type S Intelligent Drawer Unit

MDmax ST Drawer Scheme with Electric Operation

The remote control function is realized by installing an electric operating mechanism on the molded case circuit breaker. At the same time, the electrical interlock function is also perfectly provided, that is, the drawer can only be moved when the circuit breaker is in the open state.

Operation Method of Drawer with Electrically Operated Circuit Breaker:

1) Open the unit door, push the drawer in along the guide rail, and close the unit door.

2) Press the unlocking button, turn the rocker clockwise into the test position, and the unlocking button will pop out and reset.

3) Press the unlocking button again, turn the rocker clockwise into the connected position, and the unlocking button will pop out and reset.

4) Remove the rocker, move the moving button to the left, and the rocker hole will be closed and the unlocking button will be locked at the same time.

5) At this time, you can press the closing button of the electric operating mechanism to close the main switch.

6) After opening the main switch through the electric operating mechanism, move the moving button to the right. At this time, the rocker hole will open and the unlocking button will be released.

7) Press the unlocking button, insert the rocker, turn it counter - clockwise from the connected position to the test position, and the unlocking button will reset and pop out.

8) Press the unlocking button again, turn the rocker counter - clockwise to the isolated position, and the unlocking button will also pop out and reset.

9) Remove the rocker, open the unit door, lift the drawer locking handle upwards, and the drawer can be removed.

10) If due to misoperation, that is, the main switch is not disconnected and the rocker hole is not closed. If you want to remove the drawer from the connected position, you must press the position operation unlocking button. This unlocking button will trigger the main switch to open, thus ensuring that the drawer can only be moved when the main switch is in the open state.

Operation Illustration of Full - Width Drawer

Schematic diagram of drawer insertion

Schematic diagram of drawer withdrawal

Design of switchgear

Drawer-type solution - Movable unit

Movable unit

This series of functional units adopt connector technology on both the incoming and outgoing line sides. The functional units are manually positioned and have both isolation and connection positions when the door is opened. They are widely used in the motor control circuits of fixed switchgear with a power less than 37KW. Standard unit height: 150/ 200/300mm

Movable switchgear

Design of switchgear Fixed partition solution

The MDmax ST fixed partition structure switchgear features simple structure, stable performance, and multi-circuit feeding. It is suitable for the feeding of power distribution circuits. Due to the layout characteristics of the functional unit components of the fixed partition cabinet, it is not suitable for motor control circuits.

The MDmax ST fixed partition cabinet uses ABB's standard modular framework, and the multi-circuit feeder cabinet segmentation form is at least Form 3b. In terms of component selection, the MDmax ST fixed partition switchgear uses standard plug-in or draw-out components, so that the primary electrical connection of the functional unit is quality-controlled by ABB, further increasing the stability of the product. The fixed partition cabinet can provide cabinets with a width of 600mm and 800mm. Compared with the drawer functional unit, the fixed partition functional unit can reach a maximum current of 800A and only needs to occupy an installation height of 450mm.

Structural dimensions

Dimensions (height × width × depth): 2200×(600／1000)×(600／800／1000／1200)mm.

The unit compartment is installed in a space wide. The height of the unit compartment is a multiple of and can be determined according to the rated capacity. The standard functional unit specifications are 6E, 8E, 12E, 16E, 24E.

Each component is arranged in an independent compartment, and the unit components are separated from each other.

Plug-in or draw-out circuit breakers are used for fixed installation. The incoming line of the unit is realized through the connection between the circuit breaker body and the base. Fixed circuit breakers can also be used, and an incoming line terminal connector is installed on the circuit breaker mounting plate to ensure safety and reliability during on-site replacement and maintenance.

This solution can be arranged into cabinets independently or mixed with the draw-out solution.

The interior of the cabinet frame is divided into three mutually isolated compartments.

1) Compartment for unit component devices

2) Busbar compartment for main busbars and distribution busbars

3) Compartment for incoming and outgoing cables (incoming and outgoing cables can be arranged at the top or bottom)

Busbar system

The main busbars are rectangular copper busbars. The three - phase busbars are horizontally installed at the top of the cabinet. For each phase, according to the current rating, single - piece, double - piece, triple - piece, or quadruple - piece busbars can be selected, and the space of the busbar sub - area can be expanded as needed. The maximum rated current is up to 6300A.

The branch busbars are rectangular copper busbars. The cross - section can be flexibly selected according to the current. It can be single - piece or double - piece, and the maximum rated current is up to 3200A. The vertical busbar area is at the left rear of the switchgear.

The grounding protection bar and the neutral bar are installed below the switchgear. The PE bar is fixed on the frame to ensure electrical continuity.

In some applications, due to phase imbalance or the presence of harmonics, when the neutral line needs to reach 100% of the phase line, or when the incoming line switch is a 4 - pole switch, the neutral line can be placed in the main busbar area, parallel to the main busbars.

Design of switchgear: Mixed - installation cabinet solution

The MDmax ST low - voltage switchgear can achieve the mixed installation of drawer functional units, fixed - partition units, and movable units, with maximum layout flexibility. It can comprehensively apply the technical features and cost - effectiveness of drawer units and fixed - partition units according to the project nature and design scheme, optimize the power distribution scheme, and bring maximum product value to customers.

Primary circuit solution 1)

MDmax ST ACB incoming line, interconnection, and feeding

Note: 1) The external dimensions of switchgear and functional units listed in the primary circuit scheme of this volume are only the recommended minimum external dimensions. In practical applications, the external dimensions of switchgear and unit circuits will vary due to the influence of many other factors, such as the environmental conditions of the power distribution room, the installation position of the horizontal main busbar (including the N busbar), the outgoing line method of the busbar or cable, the internal partition requirements of the switchgear, the protection level of the enclosure, the rated dispersion coefficient, etc. Before signing the supply contract, Party A should conduct full technical communication with the manufacturer to determine the final relevant dimensions.

2) In the scheme of this volume, whether to choose a cabinet depth of 1000 or 1200 mm depends on the number of sheets per phase of the horizontal busbar and the outgoing line method. When there are 4 sheets per phase and the outgoing line is from the top, it is recommended to choose 1200 mm. For shallower cabinet depth requirements, please consult ABB technical personnel.

3) It indicates that when the ACB is connected to the horizontal busbar in a side-turning manner, the cabinet width is increased by 200 mm.

MDmax ST ACB Feeding

Note: ## represents the dual ACB outgoing line scheme

### represents the triple ACB outgoing line scheme

Primary circuit scheme

MDmax ST ACB is suitable for the scheme of incoming and feeding mixed installation cabinets

Note: 1) It indicates that the switchgear scheme with a width of 600 is adopted. In this scheme, there are only on-off signal lights and buttons on the door panel of the ACB unit.

MDmax ST MCCB Feeding, Lighting (Fixed Segmented Structure)

Note: 1) When the installation space for the number and cross-sectional area of outgoing cables, residual current transformers, etc. allows, the cabinet width is 600mm. Generally, a cabinet width of 800mm is recommended.

One-time circuit scheme

MDmax ST (U-shaped - draw-out structure)

Note: 1) In this volume, when the switchgear must be placed against the wall, the cabinet width should be 1000mm. Please consult ABB technicians for details.

2) In this volume, U = 200mm in the occupied equipment height.

3) In the 4P scheme, the maximum current of the vertical busbar of the drawer cabinet in this volume is 1250A. Please consult ABB technicians for schemes with larger currents.

MDmax ST (U-type - Drawer structure)

Note: 1) In this volume, U = 200mm in the occupied equipment height.

2) If you use intelligent motor control components, please consult relevant ABB personnel.

3) In this volume, when the main circuit is a motor circuit, the manufacturer should fully understand the characteristics of the load starting current. If the load has a high - multiple and long - time starting current, the specification of the drawer primary connector needs to be enlarged. For details, please consult relevant ABB personnel.

4) In principle, the drawer solution is not recommended for motor loads greater than 160KW.

5) In this volume, when the main circuit is a motor circuit, the manufacturer should understand the value of the load harmonics to avoid their impact on the primary connector.

Primary circuit scheme

MDmax ST (U - type - Drawer structure)

Note: 1) In this booklet, the occupied equipment height is U=200mm.

MDmax ST (U-shaped - drawer-type structure)

Note: 1) In this volume, U = 200mm in the occupied equipment height.

2) In this volume, the manufacturer needs to fully understand the value of the star-delta starting current and select the primary connector that matches the starting current.

Primary circuit scheme

MDmax ST (Type S - Drawer structure)

Note: 1) In this booklet, the occupied equipment height is U=200mm.

MDmax ST (Type S - Drawer-type structure)

Note: 1) In this booklet, the occupied equipment height is U=200mm.

One-time circuit scheme

MDmax ST (Type S - Drawer structure)

Note: 1) In this booklet, the occupied equipment height is U=200mm.

Reactive power compensation scheme (fixed type) 400V 50Hz

Note: 1) Three-phase common compensation or three-phase separate compensation can be selected as needed. For details, please consult ABB technical personnel.

2) The capacitor cabinet with reactors requires a forced cooling solution. The size and quantity of its fans depend on various factors such as the cabinet's protection level and the size of the air inlet.

3) If you need a composite switch for zero-crossing switching, please select it by yourself.

Components inside the cabinet

Emax 2 series air circuit breakers

The Emax 2 air circuit breaker provides protection and power management functions for low-voltage circuits from 630 to 6300A. There are multiple intelligent trip units for users to choose from. (For more information, please refer to the Emax 2 product brochure)

Tmax XT series molded-case circuit breakers

The rated current of Tmax XT molded-case circuit breakers covers all values from 1.6A to 1600A.

(For more information, please refer to the Tmax and Tmax XT product brochures)

Power quality products

The CLMD series capacitors and CLMR series reactors are used for reactive power compensation and can be perfectly combined with the UA series contactors and RVC and RVT power factor controllers to form an automatic power factor adjustment system.

The PQFS active dynamic filter can effectively suppress harmonics and improve power quality.

(For more information, please refer to the power quality product brochure)

AC contactors

Generally, two major series of AC contactors, AX and AF, are selected in the switchgear for motor control:

AX series: AC coils, 9 to 370A (AC-3)

AF series: Coils for both AC and DC, 9 to 2650A (AC-3)

(For more information, please refer to the AC contactor product catalog)

Overload relays

Overload relays are used for motor protection and can be used in conjunction with contactors of the AX and AF series. The setting range is from 0.1 to 1250A.

(For more information, please refer to the control product catalog)

Intelligent motor controller UMC100.3 motor management system

The intelligent UMC100.3 intelligent motor controller can provide multiple functions such as motor protection, control, fault diagnosis, fieldbus, and Ethernet communication. With its excellent flexibility, modularity, and expandable system, it is an ideal choice for low-voltage motors. The ABB UMC100.3 intelligent motor controller can help users' equipment maintain normal operation and maximize uptime. For more information, please refer to the UMC100.3 product catalog

Soft starters

The PSTX soft starter can effectively improve the motor starting characteristics. The rated current is from 30 to 1250A, which can effectively improve the motor starting characteristics. (For more information, please refer to the PSTX soft starter product catalog)

Internal separation forms

To protect personal and property safety, both GB/T7251.12 - 2013 and IEC61439 - 1 define different methods of independently dividing low-voltage switchgear into several compartments, which are called internal separation forms. Separation is carried out using baffles or partitions

Type 1:

No internal isolation

Type 2a:

Busbar is isolated from functional units

Busbar is not isolated from terminals

Type 2b:

Busbar and functional unit isolation

Busbar and terminal isolation

Type 3a:

The busbar is isolated from the functional units.

The functional units are isolated from each other.

The busbar is not isolated from the terminals.

Type 3b:

The busbar is isolated from the functional units and terminals.

The functional units are isolated from each other.

The terminals are isolated from the functional units.

Type 4a:

The busbar is isolated from the functional units and terminals, the functional units are isolated from each other, and the terminals connected to the functional units are in the same compartment

Type 4b:

Busbars are isolated from functional units and terminals

Functional units are isolated from each other,

Functional units are isolated from terminals,

Terminals are isolated from each other

Packaging and Transportation

Packaging

The switchgear can be packed and transported only after it is fully assembled and passes the inspection. It can be packed individually or in multiple units, but in the transportation unit, the net total length of the switchgear after splicing should not exceed 2000mm. During transportation and intermediate storage, appropriate packaging should be selected to safely protect the cabinet body.

The following equipment and materials need to be separated from the cabinet body and packed and transported separately:

• Draw-out air circuit breakers and draw-out molded-case circuit breakers with a rated current exceeding 1000A - Fuse units

• Transformers and reactors weighing more than 25kg

• Drawer units weighing more than 100kg

• Modules with single-phase control transformers greater than 2 KVAR

• Valuable precision instruments

• Fluorescent tubes

• Spare drawers

Reference table for approximate weight of switchgear

Transportation

1) Switchgear cabinets need to be loaded and unloaded using a crane or forklift.

Transportation by crane. The transport unit is packed in a box.

2) At the construction site, it is advisable to use a manual hydraulic forklift to move the switchgear on a flat surface.

When transporting by trolley, the switchgear is prone to tilting. Therefore, the distance between the wooden pallet of the switchgear and the ground is not allowed to exceed 3mm.

3) In an emergency, rollers (at least 3) can be used, but the weight of the switchgear needs to be less than 1200kg.

The switchgear cabinet must be kept vertical during transportation to avoid tilting. If the height of the doorway does not allow vertical transportation, a single cabinet (a drawer cabinet without drawers, a switchgear cabinet without a circuit breaker) can be tilted to a horizontal position. In this case, the switchgear must have a wide side for support.

Transportation by rollers (only for transport units with a weight< 1200kg)

4) For switchgear transported by crane, the transport unit must be equipped with 4 lifting feet.

Do not directly connect any equipment for hoisting to the frame. The angle of the lifting rope at the crane hook is not allowed to be greater than 120°.

Installation and Passage of Switchgear

The switchgear must be installed vertically in the power distribution room. There should be an installation base in the power distribution room. The horizontal tolerance of the base needs to be kept within ±1mm/1m, and this should be ensured by a special level detection instrument. After the switchgear is erected, it needs to be welded or fixed to the base with bolts. Bolt - fixing is only applicable when there is a cable trench for the lower cable outlet. Considering the bending radius of the cable and sufficient space, it is recommended that the height of the cable trench should be more than 500mm. See the following figure for the distance between the switchgear and the wall.

To ensure easy placement of the right - most switchgear, the distance between the right side of the switchgear arranged in a row and the wall needs to be more than 600mm.

Installation and Passage of Switchgear

The switchgear should be installed on either of the following two bases:

A concrete base buried deep underground

A floor capable of supporting the cabinet

Note: For switchgear with cables entering and exiting from the bottom, the base should have pre - reserved cable outlet holes.

Before installing the switchgear, the installation base needs to be fixed first. When fixing the installation base, the following points should be observed:

• The installation base needs to be inspected by authorized personnel

• The horizontal tolerance of the base should be kept within . This should be ensured by a dedicated horizontal detection instrument

• The base should be fixed on a non - fluctuating plane. (In accordance with the standard of DIN ISO1101)

After the switchgear is erected, it must be welded or bolted to the base. Bolt fixing is only applicable to the situation where the cables exit from the bottom and there is a cable trench. (See Figures 1, 2, 5, 6)

• The welding length at the front and back of each cabinet should not be less than 20mm. All welding points must be coated with paint to prevent corrosion (such as zinc - containing paint).

• When connecting with screws, the screws should pass through the cross - beam. The

installation holes for M8 metal pins need to be drilled on - site. (See Figures 3 and 4)

If the cabinet is fixed on the floor, the following points should be noted:

• The horizontal tolerance is the same as the requirements for base installation

• The underlying material of the floor must be firm so that the tolerance is not exceeded when filling the soil. (Especially when using insulation layers and adhesives)

• The floor must have a bearing capacity of more than 20 kN/m2. (Compression of the floor from top to bottom.)

When erecting the switchgear and welding it or fixing it to the floor with bolts, the following points should be noted:

• The welding length at the front and rear of each cabinet shall not be less than 20mm. All welding points shall be coated with paint to prevent corrosion (e.g., zinc-containing paint).

• If welding cannot be used for fixing, the switchgear shall be fixed to the ground with bolts. The necessary mounting holes shall be drilled in advance.

The above precautions must be followed to ensure that the base part of each switchgear installation remains flat. Considering the bending radius of the cables and sufficient space, it is recommended that the height of the cable trench shall be above 500mm.

Figure 1 Diagram of the base for welding and bolt fixing

Figure 2 Diagram of the base for welding and bolt fixing

Installation dimension diagram

Diagram of cable chamber opening

If cables or wires are used for incoming and outgoing lines on site, holes (square or round) need to be drilled in the bottom (top) plate. See Figure 3 and Figure 4 for the hole dimensions (all in mm).

Installation base diagram

Figure 5 Installation base diagram 1 (side view) Figure 6 Installation base diagram 2 (side view)