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RCBO tripping problem that I cannot get to the bottom of.
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<blockquote data-quote="Marvo" data-source="post: 546022" data-attributes="member: 20838"><p>IT equipment with switch mode power supplies can cause common mode noise. Depending on the capacitive value of the EMC filters and any PFC circuitry and the frequency of the noise it can cause RCD/RCBO's to nuisance trip and this tripping tendency can be amplified if it's a ring final circuit with uneven impedance values or dissimilar conductor sizes on the L and N legs. It's not possible to measure this type of noise with electrical testers so usually you'd track it down using deduction. </p><p></p><p>If the printer has an external power supply I'd start by replacing it with an alternative.... customers lie almost as much as IT guys who replace printers so assume it could still be a problem plus even if they replaced the printer they could have used the original power supply if it had the same plugs. Same with any other PSU's that are easily swapped out, try replacing them one by one. Maybe also try an identically spec'd RCBO with a similar form factor from an alternative manufacturer although if it's a 'type tested' distribution board this may be against your regs as a permanent fix.</p></blockquote><p></p>
[QUOTE="Marvo, post: 546022, member: 20838"] IT equipment with switch mode power supplies can cause common mode noise. Depending on the capacitive value of the EMC filters and any PFC circuitry and the frequency of the noise it can cause RCD/RCBO's to nuisance trip and this tripping tendency can be amplified if it's a ring final circuit with uneven impedance values or dissimilar conductor sizes on the L and N legs. It's not possible to measure this type of noise with electrical testers so usually you'd track it down using deduction. If the printer has an external power supply I'd start by replacing it with an alternative.... customers lie almost as much as IT guys who replace printers so assume it could still be a problem plus even if they replaced the printer they could have used the original power supply if it had the same plugs. Same with any other PSU's that are easily swapped out, try replacing them one by one. Maybe also try an identically spec'd RCBO with a similar form factor from an alternative manufacturer although if it's a 'type tested' distribution board this may be against your regs as a permanent fix. [/QUOTE]
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RCBO tripping problem that I cannot get to the bottom of.
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