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ZPP-P Semi-direct metering systems


  • For LV cable distribution networks;
  • Distribution of electricity and protection of electrical devices against consequences of shortings and overloads on the LV side.



Thermosetting plastic

SMC enclosure with IP 44 or 54 rating. Built to Class II protection standard, with HB to V0 flammability rating, painted in RAL 7035, with the possibility of additional painting to ensure temporary resistance to environmental factors and UV radiation.

Aluminium OU-1(2)

The enclosure made of aluminium sheet (welded or riveted). Powder painted in any colour. The size matching the type and range of devices and individual needs of the Client. The enclosure is highly resistant to degradation, environmental factors and UV radiation. The enclosure is executed in the Class I and II appliance protection standard.

Class II appliance protection rating of the enclosure is achieved with an additional insulation layer permanently applied on the internal surfaces of the enclosure. The thickness of the layer ensures the required insulation.

Labyrinth ventilation allows continuous flow of air with simultaneous elimination of penetration of pollutants and accumulation of water and moisture.

The door with internal hinges with anti-burglary lock and multiple bolts, an espag lock with a padlock or a system cylinder.

Installation parts

  • Installation profiles: steel, with openings, installed on the enclosure structure;
  • Installation base: plastic or galvanised steel, installed on vertical installation profiles made of galvanised sheet for current circuit switches;
  • Cable clamps with the cable management bar;
  • Masking panels: made of plastic or sheet metal, installed on the enclosure structure.


Incoming and outgoing section:

  • The power supply executed with separate V or VLM type terminals for two cables with the cross section up to 4x240mm²;
  • Incoming strip-type fuse-switch-disconnectors and moulded-case fuse-switch-disconnectors or MCCBs: 400/630/910/1250 A;
  • Strip-type and moulded-case outgoing disconnectors or fuse bases 160/250/400/630/910 A;
  • Space for current transformers for the metering and balancing part.

Metering and balancing section:

The metering and balancing section customised to individual requirements.

  • The metering board for installation of active and reactive energy meters installed on an insulating plastic panel, tilting or fixed;
  • The metering and inspection strip for connecting voltage and current circuits of the electricity meter with secondary sides of metering transformers, available models: Ska, LPW, other;
  • Remote reading of data from the meter over GPRS wireless network or optical fibre;
  • Space for installing the hub: the system for acquisition and transmission of measurement data in the selected Smart Grid & Smart Metering technology;
  • The components are ready for sealing.

Transformer section:

  • The current transformers match the load of the transformer, in class 0.2 – 1, for rail or cable installation, downline the main protection of the unit. The transformers may be installed in any outgoing circuit.

The components of ZPP-P systems are selected to meet the requirements of distribution companies and as requested by the Client.

Current circuits

  • The current circuits with the cross section matching the load (LgY), the PEN rail with the possibility of separating PE and N.


  • Thermosetting foundation block – matching the dimensions of the thermosetting enclosure;
  • FM aluminium foundation block – matching the dimensions of the enclosure, fitted with removable front and back covers;
  • FB concrete foundation block – built of reinforced concrete slabs, screwed with the aluminium or thermosetting enclosure;
  • Cable base.

Basic technical data

  • Rated operational voltage230/400 V
  • Insulation rated voltage500 V
  • Rated frequency50 Hz
  • Impulse withstand voltage4 kV
  • Busbar rated continuous currentup to 1200 A
  • Rated short-time withstand current20 kA (1 s.)
  • Rated peak withstand current40 kA
  • Internal arc short-circuit current16 kA
  • IP protection level44-54
  • IK level of protection against mechanical impact10
  • Appliance classII
  • Dimensions of incoming / outgoing terminals2 x 4 x 240 mm² / 4 x 240 mm²
  • Network arrangementsTN-S, TN-C, TN-C-S
  • Height / width / depthwithout limitations for aluminium enclosures built to Class II protection standards

Compliance with standards

  • PN-EN 61439-1 – „Low-voltage switchgear and controlgear assemblies. Part 1: General rules”;
  • PN-EN 61439-5 – „Low-voltage switchgear and controlgear assemblies – Part 5: Assemblies for power distribution in public networks”;
  • PN-E-05163 – „Enclosed low-voltage switchgear and controlgear assemblies. Guide for testing under conditions of arcing due to internal fault”;
  • PN-EN 50274 – „Low-voltage switchgear and controlgear assemblies – Protection against electric shock – Protection against unintentional direct contact with hazardous live parts”;
  • PN-EN 60529 – „Degrees of protection provided by enclosures (IP Code)”;
  • PN-EN 62208 – „Empty enclosures for low-voltage switchgear and controlgear assemblies – General requirements”;
  • PN-EN 62262 – „Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code). (IDT PN-EN 50102:2001)”;
  • PN-EN ISO 4628 – „Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and size of defects, and of intensity of uniform changes in appearance – Part 6: Assessment of degree of chalking by tape method”;
  • PN-EN ISO 2409 – „Paints and varnishes – Cross-cut test”.