Level distribution and metering niche in polycarbonate/metal case
It provides the electric power supply to home users in an apartment block.
Functions
- It connects the operating installation of the users in blocks of flats or commercial users to the supplier line
- It meters the active energy used by each subscriber and by the staircase lighting
- It provides short-circuit or overload protection and protection to the differentiated residual currents of the supplying columns of users
- Industrial frequency over-voltage protection of users, due to the accidental interruption of the null conductor
- The possibility of re-supplying by the user in case of safe emergency stop after a power malfunction in his installations
- The possibility of cutting the power supply by the supplier, regardless whether the user is present or not
- Protection against electric power theft or equipment destruction by offenders or unauthorized persons
Technical features:
| Thermal and usage rated current |
Max. 250A three-phase circuit
Max. 32A single-phase circuit |
| Rated power |
400/230 V a.c. |
| Rated insulation voltage |
690 V a.c. |
| Rated frequency |
50Hz ÷ 2% |
| Protection standard |
IP 30 (apparent)
IP 43 (embedded)
IP 54 (outdoor) |
Component parts
- Metallic or thermo-plastic polycarbonate case with transparent cover, with two compartments, one for metering and countering, the other for distribution (bridging bars and electric protection equipment against short-circuit, overload and fault current), placed near by
- Metal framework for mounting the single-phase counters, made of zinc-plated metal sheet
- Metal framework for mounting the bar pattern and protection equipment, made of zinc-plated metal sheet
- The access door to the general supplying compartment is provided with windows at automatic breaker in order to allow their easy connection or disconnection
- Seals for input/output cables
- SIST type safety fuses base with MPR fuses placed on general niche supplying line (from more than 6 users)
- Protection equipment is made of bi-polar differential automatic breaker (ld = 300mA) provided with protection to overload, short-circuit with breaking capacity lcu=10kA)
- Industrial frequency over-voltage protection module; they are used together with automatic breaker with triggering coil
- Bridging bars (R, S, T, NL) on insulating supports
- Indoor electric circuits made of insulated copper conductors
- Pressure gaskets or cuttings for input/output supplying cables
Operating conditions:
| Erection location |
Indoor/outdoor |
| Climate group |
WDr/CT (moderate climate: hot dry / cold temperate) |
| Environment ambient temperature range during operation |
-25 ÷ 40°C |
| Environment ambient temperature range during transportation, storing and erection |
-40 ÷ 50°C |
| Average ambient temperature in 24 hours |
35°C |
| Air relative humidity |
Max. 100% at 25°C |
| Maximum altitude |
2000 m |
| Pollution degree |
3 |
| Over-voltage category |
Category III |
| Electro-magnetic mediums |
Environment A |
| Life span |
25 years |
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