Could someone tell me what this is beside the isolator on this rather grand consumer unit? Serves a 2 bedroom apartment in Portugal.
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Indeed - in this role, single phase, basically a low pass filter or line impedance stabilisation network (LISN) , Sort of thing that smooths out fast edged spikes by having a low impedance at 50Hz but rising with frequency, Inside I expect to see a series inductor between power in and out, and a parallel capacitive shunt between the output and neutral, and some capacitive coupling out the side to allow phases to be cross linked at HF on the load side.
I wonder how much they charge for it. The ones we have on our EMC /EMP chambers are eye wateringly expensive, but these look more commercial grade. Data sheet is a bit thin on actual impedance values and maximum levels etc.
Mike.
here we go https://www.domoticalia.es/es/index.php?controller=attachment&id_attachment=63
https://www.domoticalia.es/es/index.php?controller=attachment&id_attachment=62
https://www.domoticalia.es/es/index.php?controller=attachment&id_attachment=147
so general filtering / RF isolation between the load side and the dirty mains and a narrow band tap at 120khz for the side port for linking to other lines carrying X10 signals.
Mike
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