Home three-phase switchboard assembly
In March this year, I had to pole 3 phases of LV-ABC and hung a panel of accounting (ASKUE), and I began to complete a DRC (main switchboard).
Anyone can buy a switchboard in a store, but I’m always interested in doing something with my own hands. Used the case from the lamp LB|S 250 (HS) with a glass door – very convenient to monitor the status of contacts. The size of the case W340mm x D 520mm. Degree of protection IP54.
Counter is on a support in front of the PU, set in front of the counter three-pole automatic circuit breaker C 40a. At the online store prescribed low-voltage equipment. Incoming circuit breaker four-pole circuit breaker C 32a, including fire protection RCD “Kontaktor” with rated current of 50a, differential current 100mA. UHL3. Uzo fire protection. Selective I could not find.
Next comes automatic circuit breaker C 32a on a line to the house. The house is a shield at 36 modules. In parallel with him put AV C 25a at the entrance to the workshop, in the plan is still a couple of lines to the sockets and lighting from this panel for the household unit. So I set the voltage control relay UZM-51M from Meander UHL2. On the Voltage Control Relay, the limits are set as follows: Top at 260V, Bottom limit is set at 175V.
In the house in the switchboard also are UZM from this manufacturer. For my own needs I have installed WADT C40. At the socket, which is connected to the display from a three-phase meter, I put AV with 1a.
The heating of the main switchboard.
My master bedroom, where the main switchboard is installed, is not heated and to avoid false tripping of my RCDs, I put a heater in the panel. The heater Rittal. Power supply 230 V, power of 30 watts.
I will install a three phase RCD. The switchboard has 36 modules, a regular one. I don’t think anyone will be interested. You can see the PPE in the picture below on the right. I did not put any junction boxes in the wall.
Grounding and PEN separation
The grounding situation is as follows. Thought to do in the control room separation PEN conductor and TN-C-S system.
Installation of overhead power line (Insulated Line. ie Line CIP) performed contractors. And the quality of their work I have doubts. So I made a TT system. Separation of the PEN I did not do.
The ground loop is connected to the PE bus and the incoming neutral is not connected to my ground. I hammered 4 pins (pipe diameter of 32 mm, wall thickness of 4 mm, 2.5 meters each.).
I provide services to the electrician in his city and before someone from the customers to recommend something or put in the panel, first tested at home. And so in this case – if EKF products will serve me until spring without any complaints, I will put them to my clients.
