- The obsolete voltage system does not allow for the use of three-phase electrical equipment designed to operate at a nominal voltage of 400 V without additional equipment.
- Short-circuit protection cannot be effectively utilised in the existing voltage system, which is mandatory for the construction or reconstruction of a building's internal electrical installation. This protective device effectively prevents the risk of electric shock to humans from electrical appliances and the building catching fire from electrical wiring.
- Typically, the electrical installation in buildings with an obsolete voltage system uses obsolete wiring, where under high loads (heating of wires), insulation may fail, and resulting short circuits can cause building fires.
- The power capacity in a network with an obsolete energy system is 1.7 times lower compared to a network with a new energy system.
- There are significant power losses in a network with an obsolete energy system because wire cross-sections are small and do not meet modern load requirements.