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55v between live and neutral
Former Community Member
Question I've got a 4 core hi tuff/ NYY-J cable 230v supply feeding a oil burner and 2 motorised pumps. 2 cores are lives 1 neutral and 1 earth 1 of the pumps burnt out and was replaced when checking the voltage at the switches 1 core is 230v live to neutral and live to earth as expected on the other core live to neutral I'm getting 55v and same for live to earth. Any suggestions on where too start fault finding?
Are you using a digital voltmeter? If so you might just be seeing capacitive coupling between cores - i.e. an unconnected core is acting like one plate of a capacitor with another line conductor acting as the other plate. Your voltmeter is then completing the circuit and becomes part of a potential divider with the impedance of the "capacitor" (1/2πFC) on one side and the impedance of the meter itself on the other. It's quite a common effect - in another incarnation it can cause low energy lamps to flicker or gently glow when switched off.
On the other hand you might have some damaged insulation - so do proceed with caution - just in case.
Are you using a digital voltmeter? If so you might just be seeing capacitive coupling between cores - i.e. an unconnected core is acting like one plate of a capacitor with another line conductor acting as the other plate. Your voltmeter is then completing the circuit and becomes part of a potential divider with the impedance of the "capacitor" (1/2πFC) on one side and the impedance of the meter itself on the other. It's quite a common effect - in another incarnation it can cause low energy lamps to flicker or gently glow when switched off.
On the other hand you might have some damaged insulation - so do proceed with caution - just in case.
