uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members

Discuss When testing a circuit protected by RCBO, do you test at the DB or furtherst point in the Commercial Electrical Advice area at ElectriciansForums.net

S

Sparky8898

-
Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Hi, I just have a few questions in regards to testing an RCBO circuit

Is there a requirement to test at either the furthest point or the DB or is it down to the testers discretion.

Do the test results differ?

What tests on a circuit will trip the RCBO when you are away from the DB. Is it just the tripping times test?

Thanks
 
Aico 3000
Scolmore Electrical Products
This official sponsor may provide discounts for members
Pete999

Pete999

-
Esteemed
Arms
Hi, I just have a few questions in regards to testing an RCBO circuit

Is there a requirement to test at either the furthest point or the DB or is it down to the testers discretion.

Do the test results differ?

What tests on a circuit will trip the RCBO when you are away from the DB. Is it just the tripping times test?

Thanks
Dis the circuit from the board and test from there.
 
Paignton pete

Paignton pete

-
Esteemed
Arms
If you mean testing the disconnection times of the residual current device at half, one and five times rated mA then it doesn't matter where you test from on the circuit.

I personally test at the board straight into the terminals of the device for convenience and ease. Why make things difficult.
 
D

Deleted member 26818

I prefer to test at the furthest point, so as to prove that the RCD/RCBO is providing the required protection.
I understand that some MFTs can struggle with this method, so most advice is to conduct the test at the RCD/RCBO.
 
S

Silly Sausage

PP, you've agreed with Pete, then said it doesn't matter!
Test RCDs as Pete says. The test is for the device, not the circuit.
 
Ian1981

Ian1981

-
Mentor
Esteemed
Arms
At the DB.
Imagine testing on your own in a large commercial installation and having to go and reset the rcd every time you test on the 0 and 180 degree cycles If testing at the furthest point.
Plus there should be no load on the circuit so it’s more convenient at the DB id say.
 
D

Deleted member 26818

PP, you've agreed with Pete, then said it doesn't matter!
Test RCDs as Pete says. The test is for the device, not the circuit.
The reason I disagree with this advice, is:
Testing at the device does not prove that the device is functioning as intended.
If sockets require RCD protection, then the only way to prove the sockets have RCD protection, is to my mind test at the sockets.
Where circuits require RCD protection, again the only way to prove those circuits have RCD protection, is to test the circuit.
 
S

Silly Sausage

The reason I disagree with this advice, is:
Testing at the device does not prove that the device is functioning as intended.
If sockets require RCD protection, then the only way to prove the sockets have RCD protection, is to my mind test at the sockets.
Where circuits require RCD protection, again the only way to prove those circuits have RCD protection, is to test the circuit.
We've all had this discussion years ago, I, for one, am not going to change my stance that the test is for the device only. Any circuit(s) connected are separate entities that should be tested in their own right. Are you going to do speed tests on every circuit that is connected to an RCD?
 
D

Deleted member 26818

We've all had this discussion years ago, I, for one, am not going to change my stance that the test is for the device only. Any circuit(s) connected are separate entities that should be tested in their own right. Are you going to do speed tests on every circuit that is connected to an RCD?
Yes this is a recurring discussion, neither of us have changed our viewpoint.
Personally, I very rarely conduct Periodic Inspections and when I do, I charge for a whole day.
So taking my time and conducting a thorough I&T is not a problem.
 
S

SparkyAndGeorge

-
Esteemed
Arms
Some RCBO terminals are too deep for the probes on certain testers though so you'll have no choice but to test somewhere else on the circuit.
 
Flanders

Flanders

-
Memshiled 2 rcbos fail if you test them at the board. fit a short length of cable to them and they test ok otherwise as other have said test and board or any where on the circuit, just need to make sure all loads are disconnect when you test it .
 
KEV 1 N

KEV 1 N

-
Esteemed
Arms
Memshiled 2 rcbos fail if you test them at the board. fit a short length of cable to them and they test ok otherwise as other have said test and board or any where on the circuit, just need to make sure all loads are disconnect when you test it .
Yes....they are a pain in the ar*e!:mad:
 
uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members

Reply to When testing a circuit protected by RCBO, do you test at the DB or furtherst point in the Commercial Electrical Advice area at ElectriciansForums.net

Bulk Workwear - Clothing Suppliers for the Whole Forum Network
This official sponsor may provide discounts for members
Thread starter Similar threads Forum Replies Date
L Commercial Electrical Advice 23
Top Bottom