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Topic # 192377 8-Mar-2016 20:30
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I have been told there are mainly 2 types of RCD tripping method, one is "purely electronmagnet", the other is "electronmagnet-electric" which has additional circuit. The former is still operational even when the feeding N is missing because it doesn't need a power supply, while the latter is more precise and cheaper to make.

 

So what type is the often seen PDL RDC691?

 


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  Reply # 1508493 8-Mar-2016 21:12
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What an odd question... I'm curious about why someone wants to know this.

I can't tell you which it is, but I can say that no matter which it is, if there is no neutral, it WILL trip when used.




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  Reply # 1508525 8-Mar-2016 22:33
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Not sure I get the question either, but if it's about what the RCD does when turned on and there's a power cut, then the PDL RCD shown stays "on" - unlike cheap plug-in RCDs which require power to a solenoid to keep spring-loaded contacts closed.  I'd have presumed that the type as per the PDL device are more complex (and they are more expensive) because the simpler plug-in type fail state would be to cut power, but as this wouldn't happen with the "always on" type, then the circuitry / design would need to be much more robust.  Having a protective device which might not work when needed may be more dangerous than having no protective device at all.


 
 
 
 


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  Reply # 1508602 9-Mar-2016 07:35
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If the power fails the PDL 691 remains latched so things like fridges will restart. Portable rcd are normally active types that unlatch when the power is cut because they are more often used with things that shouldn't come on unsupervised.

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  Reply # 1509958 9-Mar-2016 15:40
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Bung: If the power fails the PDL 691 remains latched so things like fridges will restart. Portable rcd are normally active types that unlatch when the power is cut because they are more often used with things that shouldn't come on unsupervised.

 

I was under the impression that the portable ones are required to unlatch when power is lost.


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  Reply # 1509977 9-Mar-2016 16:07
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Huchiz:

 

I have been told there are mainly 2 types of RCD tripping method, one is "purely electronmagnet", the other is "electronmagnet-electric" which has additional circuit. The former is still operational even when the feeding N is missing because it doesn't need a power supply, while the latter is more precise and cheaper to make.

 

So what type is the often seen PDL RDC691?

 

 

 

 

 

We have a PDL 691RCD in our bathroom.

 

After a power cut (we've had several recently), a manual reset IS required.

 

 

 

 





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  Reply # 1509990 9-Mar-2016 16:34
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Sideface:

 

We have a PDL 691RCD in our bathroom.

 

After a power cut (we've had several recently), a manual reset IS required.

 

 

 

 

 

Must be different revisions, I've seen some that don't reset under power failure.


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  Reply # 1509993 9-Mar-2016 16:37
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RunningMan:

 

Bung: If the power fails the PDL 691 remains latched so things like fridges will restart. Portable rcd are normally active types that unlatch when the power is cut because they are more often used with things that shouldn't come on unsupervised.

 

I was under the impression that the portable ones are required to unlatch when power is lost.

 

 

that what he said isnt it?


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  Reply # 1509999 9-Mar-2016 16:46
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Jase2985:

 

RunningMan:

 

Bung: If the power fails the PDL 691 remains latched so things like fridges will restart. Portable rcd are normally active types that unlatch when the power is cut because they are more often used with things that shouldn't come on unsupervised.

 

I was under the impression that the portable ones are required to unlatch when power is lost.

 

 

that what he said isnt it?

 

 

Yes, pretty much. I was adding that I thought it was a requirement that this occur.


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  Reply # 1510031 9-Mar-2016 17:39
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I wasn't sure if caravan leads were the same so left a little bit of room.

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  Reply # 1510036 9-Mar-2016 17:45
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RunningMan:

 

Sideface:

 

We have a PDL 691RCD in our bathroom.

 

After a power cut (we've had several recently), a manual reset IS required.

 

 

 

 Must be different revisions, I've seen some that don't reset under power failure.

 


There was a product recall of a faulty batch of these switches in 2008: Worry over faulty electrical safety device

and

http://www.energysafety.govt.nz/documents/consumer/safety-alerts/Product%20Safety%20Recall.pdf

 


Is it possible that these faulty ones DID NOT require a manual reset after a power failure?





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  Reply # 1510071 9-Mar-2016 18:34
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What's so hard about this folks?

 

The PDF data sheet linked to above above clearly states:

 

This product will remain unaffected by loss of power supply.

 


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  Reply # 1510082 9-Mar-2016 18:46
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The cutting out on portable ones is part of some other AS/NZS for construction sites or something. Everyone makes them to that because that is a bulk of their demand.

 

Its annoying when you want them for aquariums where you don't want them to trip on every small outage. There was one brand that didnt trip out but its not available anymore. So I just have some of those overpriced flush box mounted ones for the heaters in the tanks.





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  Reply # 1510109 9-Mar-2016 19:37
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When outage, the PDL still connects. 

 

So for these PDLs, if the neutral is cut and the live still on (wiring fault) when the current is 0, will it trip or keep the live still connected? 

 

It it trips, then it's safe. If it doesn't, will it trip if there is any current goes from live to earth cable or just anything else, eg. human body? 


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  Reply # 1510151 9-Mar-2016 21:16
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Huchiz:

 

When outage, the PDL still connects. 

 

So for these PDLs, if the neutral is cut and the live still on (wiring fault) when the current is 0, will it trip or keep the live still connected? 

 

It it trips, then it's safe. If it doesn't, will it trip if there is any current goes from live to earth cable or just anything else, eg. human body? 

 

 

 

 

If you mean the neutral between the switchboard and this switch plate, then if that was not connected, the RCD would not trip if you touched the phase (ie downstream of the RCD).  It needs power to trip.

 

That may be the real/primary reason why non-latching RCDs like this aren't used except with fixed wiring.  

 

 




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  Reply # 1510176 9-Mar-2016 21:54
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Fred99:

 

Huchiz:

 

When outage, the PDL still connects. 

 

So for these PDLs, if the neutral is cut and the live still on (wiring fault) when the current is 0, will it trip or keep the live still connected? 

 

It it trips, then it's safe. If it doesn't, will it trip if there is any current goes from live to earth cable or just anything else, eg. human body? 

 

 

 

 

If you mean the neutral between the switchboard and this switch plate, then if that was not connected, the RCD would not trip if you touched the phase (ie downstream of the RCD).  It needs power to trip.

 

That may be the real/primary reason why non-latching RCDs like this aren't used except with fixed wiring.  

 

 

 

 

 

 

Yes, that's what I'm talking about in the first place. Sorry I didn't make it clear enough. :D


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