An entity may be connected to distribution network in accordance with:

• Class I     - entities connected directly to transmission network,
• Class II    - entities connected directly to 110 kV rated voltage distribution network,
• Class III  - entities connected directly to distribution network of rated voltage greater than 1 kV and smaller than 110 kV,
• Class IV - entities connected directly to distribution network of rated voltage not greater than 1 kV and connection capacity greater than 40 kW or rated current of pre-meter safety device greater than 63 A,
• Class V  - entities connected directly to distribution network of rated voltage not greater than 1 kV and connection capacity greater than 40 kW, and rated current of pre-meter safety device not greater than 63 A,
• Class VI - entities connected to the network with a temporary service line operating under the terms of Agreement on service line to be replaced by a permanent service line, or entities connected to the network for a specified period of time, but in any case not longer than one year.

1. safe operation of electric power system;
2. system security against damage caused by inappropriate operation of connected equipment, installations and networks;
3. security of connected equipment, installations and networks against damage in case of a break-down, or constraints in electricity consumption or supply;
4. adherence to electricity quality parameters at the connection point of said equipment, installations and networks;
5. compliance with environmental protection requirements, as set forth in separate regulations;
6. capacity for quantity metering and measurement of parameters required for network operation and billing for consumed fuels or energy.