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Some days

hughie

hughie

Joined
Oct 1, 2008
Messages
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Location
Sydney Australia
I have a couple of dust collectors one Jet the other is a Jet knock off by the look of it. the non Jet is a atmospheric type that cleans up the dust hanging in the air. Recently it has started to flip the RCD or Residual Current Device that compulsory on all house and commercial wiring boards nationwide. Which probably means its motor, darn. Well I could change it as its over 25 years old. But in my experience they rarely play up and usually the fault lies with the appliance, and of course its high in the middle of the shop surrounded by gear that came after installation.
 

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hughie said:
I have a couple of dust collectors one Jet the other is a Jet knock off by the look of it. the non Jet is a atmospheric type that cleans up the dust hanging in the air. Recently it has started to flip the RCD or Residual Current Device that compulsory on all house and commercial wiring boards nationwide. Which probably means its motor, darn. Well I could change it as its over 25 years old. But in my experience they rarely play up and usually the fault lies with the appliance, and of course its high in the middle of the shop surrounded by gear that came after installation.
Click to expand...

Is the RCD (which I assume is similar to GFCI or AFCI, Ground Fault or Arc Fault, in the US?) absolutely required even on circuits with motors? I had to completely remove fault protection from the 250V 30A breaker I use for my Powermatic. The lathe uses a VFD, which are just flat out incompatible with GFCI or AFCI (or any combination) just due to the nature of how they function. When I had the G/AFCI breaker in place, it would trip within 10-20 seconds of turning the lathe on, every single time. Once I removed it, the lathe worked perfectly, and has ever since. I also tried a receptacle with GFCI protection, but it, too, was always tripped. The receptacle was a lot harder to source and very expensive, so I returned it pretty promptly.

The thing about motors, is they do tend to arc a little bit, right? There is no exclusion for motor appliances with RCD?
 
Jon Rista said:
Is the RCD (which I assume is similar to GFCI or AFCI, Ground Fault or Arc Fault, in the US?) absolutely required even on circuits with motors? I had to completely remove fault protection from the 250V 30A breaker I use for my Powermatic. The lathe uses a VFD, which are just flat out incompatible with GFCI or AFCI (or any combination) just due to the nature of how they function. When I had the G/AFCI breaker in place, it would trip within 10-20 seconds of turning the lathe on, every single time. Once I removed it, the lathe worked perfectly, and has ever since. I also tried a receptacle with GFCI protection, but it, too, was always tripped. The receptacle was a lot harder to source and very expensive, so I returned it pretty promptly.

The thing about motors, is they do tend to arc a little bit, right? There is no exclusion for motor appliances with RCD?
Click to expand...
RCD's work just fine motors. I am not sure how RCD's compare to your set up. There a couple of known exceptions in new houses often the oven/cooktop is wired with its own circuit independent of the RCD as elements have been known to leak and in the past the fridge circuit. There's virtually no time delay when it trip [ 25–40 milliseconds ], they are so sensitive you cant use a metre to check the circuit, testing is usually done via the test button on the RCD.

Heres a brief description
  • RCDs monitor the current flowing through the circuit's live and neutral wires.

  • Normally, the current flowing into and out of a load is balanced.

    • When a fault occurs (e.g., a person touches a bare conductor), some current may leak to the ground, creating an imbalance.
    • RCDs detect this imbalance and quickly disconnect the power supply, often within milliseconds, to prevent harm.
 
hughie said:
RCD's work just fine motors. I am not sure how RCD's compare to your set up. There a couple of known exceptions in new houses often the oven/cooktop is wired with its own circuit independent of the RCD as elements have been known to leak and in the past the fridge circuit. There's virtually no time delay when it trip [ 25–40 milliseconds ], they are so sensitive you cant use a metre to check the circuit, testing is usually done via the test button on the RCD.

Heres a brief description
  • RCDs monitor the current flowing through the circuit's live and neutral wires.

  • Normally, the current flowing into and out of a load is balanced.

    • When a fault occurs (e.g., a person touches a bare conductor), some current may leak to the ground, creating an imbalance.
    • RCDs detect this imbalance and quickly disconnect the power supply, often within milliseconds, to prevent harm.
Click to expand...
That is exactly what a GFCI (Ground Fault Circuit Interrupter) does.
 
hughie said:
RCD's work just fine motors. I am not sure how RCD's compare to your set up. There a couple of known exceptions in new houses often the oven/cooktop is wired with its own circuit independent of the RCD as elements have been known to leak and in the past the fridge circuit. There's virtually no time delay when it trip [ 25–40 milliseconds ], they are so sensitive you cant use a metre to check the circuit, testing is usually done via the test button on the RCD.

Heres a brief description
  • RCDs monitor the current flowing through the circuit's live and neutral wires.

  • Normally, the current flowing into and out of a load is balanced.

    • When a fault occurs (e.g., a person touches a bare conductor), some current may leak to the ground, creating an imbalance.
    • RCDs detect this imbalance and quickly disconnect the power supply, often within milliseconds, to prevent harm.
Click to expand...

That's how GFCI works. They definitely don't work with a VFD... Is RCD a breaker, or is it something more complex?
 
Lol and these headings/titles etc will vary with each country and so for me they are all dust collectors. They all collect, extract, filter, take away, remove, clean, etc.

The thing is it dang well died and its an very awkward position to remove by one man and I am comin into my busiest time of turning, as I said some days diamonds
 
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