colingaffney
Junior Member
I have a 3 phase installation arcing just above the main MCCB switch integral within a 250amp 3 phase hager fuseboard .
It is the buzz bar linking kit .
It has blown all 3 250amp fuses in the main head twice now .
On the 1st visit all 3 fuses had blown and nothing else and then the 2nd time all the fuses blew + the mccb switch had blown also .
There is no loose connection eg all nuts and bolts are tight and i'm getting more then 200m ohms if I test between the earth and any of the phases or between any of the phases .
The strange thing is there is about 20 volts coming through one of the phases to earth even though the main fuses are blown .
The buzz bars are fairly damaged eg what looks like chipped at the edges presumably through arcing .
Does anyone know what this means .
Colin
It is the buzz bar linking kit .
It has blown all 3 250amp fuses in the main head twice now .
On the 1st visit all 3 fuses had blown and nothing else and then the 2nd time all the fuses blew + the mccb switch had blown also .
There is no loose connection eg all nuts and bolts are tight and i'm getting more then 200m ohms if I test between the earth and any of the phases or between any of the phases .
The strange thing is there is about 20 volts coming through one of the phases to earth even though the main fuses are blown .
The buzz bars are fairly damaged eg what looks like chipped at the edges presumably through arcing .
Does anyone know what this means .
Colin