Outdoor Cabinets SZD

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Outdoor Cabinets SZD

Outdoor Cabinets SZD

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Outdoor Cabinets SZD
Outdoor Cabinets SZD
Description Specification Configurator Accessories Connected
Piotr Kłysz piotr.klysz@zpas.pl +48 74 872 0688 +48 667 992 300

In the period of last few years, the increase of telephoneusers and density of ducts surrounding cities which are endangered on easy damage, forces the manufacturers of telecommunication links to work out and use ducts under the earth-surface. Together with the increase of transferring wider frequency band, it appeared that there are some difficulties with providing appropriate quality of transmission with using copper wires. Wider pass bands in fast networks, like Gbit Ethernet or ATM, means necessity of assistance the copper wires with complicated electronic systems. That is the reason why fibre optics became alternative solution to copper wires.

Not mentioning creation of brand-new networks, one of the biggest tasks for telecommunication network is protection of already made investments and re-usage of the biggest possible part of already existing cable-networks. This possibility is given by access systems. Access systems enable gradual changing distributive copper wires with fibre optics. This solution allows using existing exchange lines not only for transmission telephone and I SDN services, but also for transmission 2Mb/s flux with using digital exchange line technology.

The technology of access exchange guarantees updating existing transmission network with usage of valuable electronic equipment. I n order to lower the costs of modernisation, the most common solution is joining old part of installation (copper wires) with new one (fibre optic cables) in outdoor access cabinets (like SZD).

The main task of outdoor access cabinet is full protection of installed equipment. The cabinet fulfils the requirements of protection against negative influence of environment (rain and snow falls, sun, dust etc) and vandalism. Another very important task of SZD cabinets is providing specified climatic conditions which depend on installed equipment.

The construction of SZD cabinet enables optional arrangement of inside equipment. I t makes possible to use SZD cabinets not only in access systems, but also in each case where the protection of outdoor equipment working in extreme conditions is very important. SZD cabinets produced by ZPAS have been already used in telecommunication industry, on ships, platforms, stamping press and intermediate pumping gas stations, heat and power stations, power industry plants, refineries, cement plants, for protection of machinery for outdoor lightening operating etc.

Technical data

Cabinets framework - aluminium profile,
Side shields and doors - aluminium profile,
Roof (internal mantle) - 1.5 mm thick aluminium sheet,
Roof (external mantle) - alternatively stainless and plinth steel sheet, Al-Zn coated (aluzinc) steel sheet or aluminium sheet.

Surface finishing:
Aluminium profiles of the framework and aluminium frames of shield and doors: Anodised (in EMC version chromate coated and powder painted in RAL 7035)
Aluminium profiles of shield and doors: Chromate coated and powder painted in RAL 7035
Internal mantle of the roof: Natural aluminium
Plinth and external mantle of the roof:
Powder painted in RAL 7035 In EMC version of the cabinet conductivity between each elements of the construction in esured.

Protection Degree:
Standard cabinets have got protection degree IP 54 in accordance with EN 60529. I f required it can be increased up to I P 55.

ZPAS reserves the rights to implement changes in construction. All technical solutions used in construction of SZD cabinets are reserved in Patent Office of Poland.


Supporting structure of the cabinet is the framework made of aluminium profiles, which are joint together by adaptors. In profiles there are special ducts, which enable the assembly of swing frame or optional creation of supporting structure for mounting equipment. The framework of the cabinet is in standard set on the plinth. The height of the plinth depends on customer’s request: from 40 to 300 mm.

Doors, side shields

Doors and side shields of SZD cabinets are made of aluminium rail-profiles which are fastened together. The aluminium profiles make double ventilation wall. I n the cabinet there are mounted two-point rod-latch locks. The door handle is made of zinc and aluminium alloy. On customer’s request it is possible to have optional type of patent insert (ABLOY, KABA, EMKA, etc). I t is possible to make special opening for temporary cable entry (e. g. from outside power supply unit).

Standard roof for SZD

Standard roof for SZD cabinets is made of two mantles of 1.5 mm thick sheet steel. B etween the mantles there is a gap, which enables to carry away accumulated condensation water.

Roof in special configuration

When it is necessary to cool the cabinet not only by ventilating through side shields and doors but also additional cooling system, it is possible to use special roof made of three mantles of sheet steel. This solution creates two air chambers in one of them it is possible to fasten fan units which increase the airflow. Applying two-chambers roof causes, that the total height of the cabinet is increased by 100 mm. Additionally, it is possible to fix lifting eyes into the roof.

Dimensions of SZD cabinets

The SZD cabinet has a modular design. The main part of the cabinet is made of panels (which are fastened by latches) and aluminium profiles. B oth panels and profiles can be cut to any length. This type of design makes it possible to achieve the desired cabinet dimensions Every cabinet is designed and manufactured on individual request (together with interior installation – it is possible to create all types of partitions and supporting structures of the cabinet).
As a standard, the technology allows for the manufacture of cabinets with single or double leaf doors.

Standard dimensions of ca binets with single leaf door

External width W[mm] Internal width W1 [mm] External depth D[mm] Internal depth D1[mm]
409 283 409 283
509 383 509 383
609 483 609 483
709 583 709 583
809 683 809 683
1009 883 1009 883


Standard dimensions of cabinets with double leaf door

External width W [mm] Internal width W1 [mm] External depth D [mm] Internal depth D1 [mm]
1154 1028 409 283
1254 1128 509 383
1354 1228 609 483
1453 1328 709 583
1554 1428 809 683
1654 1528 1009 883



Ventilation with forced internal and free external air circulation

Fan units are mounted inside SZD cabinet in order to shorten time of carrying away heat dissipation emitted by equipment installed in the cabinet. Fan units cause faster air movement inside the cabinet and in the cabinet’s walls. I n case of low temperature the system of heaters joint with thermostats is applied. Above solutions enable failure-free operation of access systems.

Pictorial diagram of supplying fan units and heaters Diagram of air flow Air flow in standard roof


Ventilation with forced internal and external air circulation

In cabinets which are endangered of strong solar radiation, it is recommended to use ventilation with double air circulation. I n this solution, air circulates inside the cabinet and additionally flows between the double walls of the cabinet. Moreover, circulation of external air is forced by fan units mounted in the roof. I n case of low temperature the system of heaters joint with thermostats is applied. Above solutions enable failure-free operation of access systems.

Pictorial diagram of suplying fan units, roof ventilators and heaters Diagram of air flow Air flow in non-standard roof


Ventilation based on use of heat exchanger and direct venting

In order to intensify the cooling process in cabinets with installed equipment with high heat dissipation, there is solution based on cross heat exchanger. Heat exchanger is a type of radiator, where there are two air flows: warm from the inside of the cabinet (radiator’s plates collect heat) and second from the outside of the cabinet (cooled by exchanger). Cross system of the heat exchanger enables to retain tightness of the cabinet and external and internal air flows do not mix together. Another solution is direct venting of the cabinet, which is used when it is necessary to carry away lots of heat dissipation. I n cabinet’s roof or on the door there are mounted fans which pull external air (through double wall and filters system). External air goes through appliances which emit heat and is carried away outside by roof or perforations on the doors.

Pictorial diagram of air circulation in the cabinet with direct venting Pictorial diagram of air circulation in the cabinet with heat exchanger mounted on the roof Pictorial diagram of air circulation in the cabinet with heat exchanger mounted on the door


Air conditioned SZD cabinets

Air conditioners are used when the required temperature inside of the cabinet is lower than ambient temperature. The power of air conditioners is selected according to pre-set climatic conditions, heat dissipation by active equipment and dimensions of the cabinet. On individual customer’s request the air conditioners can be fixed inside or outside of the cabinet. I n case of inside installation, they are usually fixed on the doors or side shields, what enables easy service access.


EMC shielded cabinets

EMC shielded cabinets are used when devices which are mounted inside the cabinet require protection in electromagnetic compatibility. Aluminium profiles used in the cabinet are additionally chromated. Special current conductive gasket is used in order to provide conductivity between each element of the cabinet (roof, plinth, side shields, door).


Outdoor cabinets made of aluminium sheets

Outdoor cabinets made of aluminium sheets come in two types: Single-wall cabinet – made of sheet metal with a thickness of 2 mm Double-wall cabinet – outer jacket and metal sheet frame with a thickness of 2 mm, metal sheet inner cladding with a thickness of 1 mm or 1.5 mm (depending on the cabinet size).All outdoor cabinets are custom-made. You can order a cabinet in size, with partition of cabinet's interior and supporting structure of your choice.To ensure appropriate climatic conditions inside an enclosure, we use various types of heat removal systems (ventilating fans, heat exchangers, air conditioners), and the right number of heaters, depending on your needs. To improve insulation, the cabinet's interior can also be lined with insulating foam. The cabinets have I P 54 protection degree.


Cabinet made of Al-Zn coated sheet steel


Cabinet made of stainless sheet steel

Attribute Value
Catalogue number 3573 wz-szd-

Page ID: 3573 wz-szd-