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    Duet 3 keeps blowing the breakers in my house when powered on!!!

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    • A Former User?
      A Former User @eddygara
      last edited by

      @eddygara said in Duet 3 keeps blowing the breakers in my house when powered on!!!:

      The board will blow my home breakers ever time it’s powered on.

      with the risk of repeating myself - its very unlikely to be the board, but rather the mains wiring.

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        What breakers are blowing: current limit breakers, or RCD (aka GFCI) breakers?

        I had a problem last year that the master RCD breaker in the consumer unit would trip whenever I turned on the laser printer in my office. Suspecting a faulty class Y capacitor (the ones between mains input and ground that help suppress EMI), I replaced the Class Y capacitors in it. A little while later, the problem returned. Eventually I realised that it only occurred when both our new induction hob and several pieces of equipment in my office were turned on.

        What was happening is that the leakage of the hob plus mains wiring capacitance plus the class Y capacitors in all my office equipment together created enough current between live and neutral to trip the 30mA RCD.

        I fixed it by relocating the hob/cooker circuit to the non-RCD-protected side of the consumer unit, using a RCBO (combined current breaker and RCD) on that circuit instead of a plain current breaker.

        I've since read that induction hobs are renowned for tripping RCDs. I guess they have larger class Y filtering capacitors than most other devices, because of the amount of EMI they would otherwise generate.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        Phaedruxundefined 1 Reply Last reply Reply Quote 0
        • Phaedruxundefined
          Phaedrux Moderator @dc42
          last edited by

          @dc42 said in Duet 3 keeps blowing the breakers in my house when powered on!!!:

          RCD (aka GFCI) breakers?

          Based on the photos earlier no, they look like standard north america breakers.

          Z-Bot CoreXY Build | Thingiverse Profile

          dc42undefined 1 Reply Last reply Reply Quote 0
          • A Former User?
            A Former User
            last edited by

            Some of them were tagged GFI - does that refer to protected outlets in the circuit?

            Phaedruxundefined 1 Reply Last reply Reply Quote 0
            • dc42undefined
              dc42 administrators @Phaedrux
              last edited by dc42

              @Phaedrux said in Duet 3 keeps blowing the breakers in my house when powered on!!!:

              Based on the photos earlier no, they look like standard north america breakers.

              Here in the UK you can get RCBOs, which combine a current breaker with a RCD (aka GFCI). Might it be one of those?

              EDIT: the ones with TEST buttons are RCBOs.

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

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              • whosrdaddyundefined
                whosrdaddy
                last edited by whosrdaddy

                I had an instance with one of my printers where the IEC connector fuse would blow after 10 minutes.
                At first I thought that the fuse had died, but after 2 additional fuses died, I replaced the fuse again and
                monitored the printer while powered, at that moment I realized that the IEC connector was getting really hot!!! (It was a crappy chinese one, bought via Amazon). After replacing the connector with a better specimen, the problem was solved, for some reason there was a bad connection inside the connector causing sparks and resulting heat.

                Long story short, check your IEC connector (and get one with a fuse) 😉

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                • A Former User?
                  A Former User
                  last edited by

                  One of the IEC connects were questionable to say the least.

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                  • dc42undefined
                    dc42 administrators @eddygara
                    last edited by

                    @eddygara said in Duet 3 keeps blowing the breakers in my house when powered on!!!:

                    @bearer just removed the bed wiring all together, so no power is being drawn in from the bed. Breakers still blew. Again not sure what my issue could be?? So strange that this thing could be drawing that much power!

                    Here’s a pic of my breaker terminal if that help!

                    https://i.imgur.com/LV4RTOI.jpg

                    Which of those breakers trips?

                    Duet WiFi hardware designer and firmware engineer
                    Please do not ask me for Duet support via PM or email, use the forum
                    http://www.escher3d.com, https://miscsolutions.wordpress.com

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                    • Phaedruxundefined
                      Phaedrux Moderator @A Former User
                      last edited by Phaedrux

                      @bearer said in Duet 3 keeps blowing the breakers in my house when powered on!!!:

                      Some of them were tagged GFI - does that refer to protected outlets in the circuit?

                      Yes. In North America any ground fault protection is typically present in the socket at the point of use rather than at the breaker.

                      Z-Bot CoreXY Build | Thingiverse Profile

                      dc42undefined 1 Reply Last reply Reply Quote 0
                      • dc42undefined
                        dc42 administrators @Phaedrux
                        last edited by

                        @Phaedrux said in Duet 3 keeps blowing the breakers in my house when powered on!!!:

                        @bearer said in Duet 3 keeps blowing the breakers in my house when powered on!!!:

                        Some of them were tagged GFI - does that refer to protected outlets in the circuit?

                        Yes. In North America any ground fault protection is present in the socket at the point of use rather than at the breaker.

                        Some of the breakers illustrated have TEST buttons. Those look like RCBOs (combined current breaker and GFCI) to me.

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

                        Phaedruxundefined 1 Reply Last reply Reply Quote 0
                        • Phaedruxundefined
                          Phaedrux Moderator @dc42
                          last edited by

                          @dc42 That could be.

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • A Former User?
                            A Former User
                            last edited by

                            It doesn't make a whole lot of sense to have the full rated breaker current as the fault current without being able to see/hear/smell it to me.

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