The question I picked up on was Sam's about running a PC on reversed grounding conductors, as I have experience feeding these line to line with a grounding conductor and the units working fine I felt I could jump in.Originally posted by hurk27:
And while some designers might install a MOV device to try to block any transient spike between the neutral and ground. It wouldn't be below the 130 volt threshold of a MOV that would be used on a line to neutral as this would be a very poor design. Most transient spikes that damage equipment are line to neutral and this is because this is where the load should always be connected. so why would you install a MOV between neutral and ground when any surg's between these would not have a load to damage. Also if a MOV with a 2 volt threshold was installed between the ground and neutral it wouldn't last any way as any voltage drop in the neutral would cause current in the MOV as the most circuits will have more than a 2 volt drop. the EGC wont have the voltage drop as it will be at the main neutral bar potential. because there is no current on it to cause a drop.
Bob, I just wanted to point out jimwalker, and Sam made a point. There is poor design in consumer grade electronics. It revolves around competition, cost cutting measures, FCC, and foreign electrical architectural differences. If you look here http://www.arrl.org/notes/1816/templates/13v40aps.pdf , you will see a similar design. I have built 4 of these 13.8 VDC@ 40-amp power supplies for HAM radio, and it is similar to all commercial switch mode power supplies with a 3-wire ACEG (EGC) input. You will notice it can accommodate either 120 or 240 volt input with a flick of a switch. Look at the AC portion before the diode rectifier bridge; you should notice there is no reference to AC ground other than a RFI filter. Input polarity makes no difference.Originally posted by iwire:
[QB] Dereck no problem I was busy putting together my last post while you put up yours./QB]
You are right Jim the service person does not have to do that and an honest one will not.Originally posted by jimwalker:
Why would you feel he needs to do this ? This is a new washer and under warranty.He gets paid by the mfg.to repair it if the washer was defective.