OP
Deleted member 26818
Is someone suggesting here, that when you install RCDs, you don’t measure the Zs?
Discuss Are you based in Frimley???????? in the UK Electrical Forum area at ElectriciansForums.net
The first one is an RCBO (61009), the other two are two RCDs (61008) covering a group of MCBs each. So the RCDs themselves don't require a Zs test, rather the MCBs they cover do. I think the way he has used a circuit to write down the RCDs is confusing.I wonder why it’s applicable for one RCD, but not for the other two?
Yep. I think someone's getting mixed up.The first one is an RCBO (61009), the other two are two RCDs (61008) covering a group of MCBs each. So the RCDs themselves don't require a Zs test, rather the MCBs they cover do. I think the way he has used a circuit to write down the RCDs is confusing.
Sure am.....not for the RCD's themselves, anyway.Is someone suggesting here, that when you install RCDs, you don’t measure the Zs?
Have you ever done this? If you have then I suspect you are the only one!or you can record the highest measured value for the circuits the RCD protects.
By taking a zs of the protected rcd circuits and even the ze then we know that 50v/0.03 is satisfied anyway however the zs is measured to ensure ADS of the over current protective device.You have to know the Zs to ensure the RCDs will work.
<1667 Ohms for 30mA
<500 Ohms for 100mA
<167 Ohms for 300mA
<100 Ohms for 500mA.
You cannot say it’s not applicable.
You can leave it blank because you’ve tested all the circuits protected by the RCD, or you can record the highest measured value for the circuits the RCD protects.
I’m guessing your talking about rcd testing half times 1x and 5x tests and not a zs of the rcd as they are not the same.You have to know the Zs to ensure the RCDs will work.
<1667 Ohms for 30mA
<500 Ohms for 100mA
<167 Ohms for 300mA
<100 Ohms for 500mA.
You cannot say it’s not applicable.
You can leave it blank because you’ve tested all the circuits protected by the RCD, or you can record the highest measured value for the circuits the RCD protects.
These values are for if you need the RCD to provide fault protection as well as additional protection. So in most situations they are not applicable.You have to know the Zs to ensure the RCDs will work.
<1667 Ohms for 30mA
<500 Ohms for 100mA
<167 Ohms for 300mA
<100 Ohms for 500mA.
You cannot say it’s not applicable.
You can leave it blank because you’ve tested all the circuits protected by the RCD, or you can record the highest measured value for the circuits the RCD protects.
Reply to Are you based in Frimley???????? in the UK Electrical Forum area at ElectriciansForums.net
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