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Caravan Site - Overheating supply neutral connection on pitch RCDs

DMB

Hi,

Am presently staying at a farm caravan park in south of England and the owner has shown me a problem he is having with some individual pitch electrical devices. Apparently, over time a number of the Type C  16A RCD devices have been affect by the INCOMING supply neutral connection overheating. Seems unlikely to be loose connection on so many devices and device are not tripping. 
site is served by overhead 2 phase connection with single phase distribution to at least 3 sepeate areas built at different times. Pitches are served by buried SWA and marked up as “ring”. RCDs are British supplier and all other connections on the 30mA device are clean and unaffected. Are we looking at an harmonics problem or distribution system fault. All suggestions welcome (It won’t spoil my holiday) Thanks

Dave



  • 0 in reply to DMB

    Hi,

    Could the burnt out neutral be due to lightning strike with fault on N-E SPD?

  • 0 in reply to KDY

    I notice this answer has the orange box around it, does that imply KDY have solved the mystery? 

  • 0 in reply to AMK

    Returning to the discussion on harmonic theory, I assume we are not referring to triplen harmonics ? Instead, we are addressing the odd multiples, although  less common in AC circuits. Andy/Mike. My understanding is that triplen harmonics only become problematic within three-phase distribution systems. particularly in three-phase four-wire circuits where the neutral conductor is involved. The issue with triplen harmonics lies in the combined currents circulating within the neutral conductor, which can lead to significant imbalances and potential overheating only in a three-phase, four-wire distribution system. So why is the neutral overloading on the line side of a single phase RCD?  

  • 0 in reply to Chris Pearson

    I know. My point was having to consider duty cycle impact on circuit calcs

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