Questions regarding testing for Main/Sub Distributor board.

[tony mc]

Must type faster :crazy:

 

[nazoom]

I just need to clarify this and make sure i got it right!

So what happens at DB2? Where do I make contact there for R1 +R2 value?

1-Do I use the RCD Line (L) hole, and the MET as my connections to measure R1+R2 at DB2? I mean link the Line and cpc at DB1 and then use one of the probe to make contact with line (L) hole for RCD in the DB2 to measure R1, and at same time make contact with other probe to MET and this will measure R2?

OR

2- I Link the Line and cpc at DB1, and then disconnect the feed Line in the DB2 (conductor coming from the DB1 to DB2) this is R1 and make contact with one probe, then disconnect the CPC at DB2 (coming from the DB1 to DB2) and use the other probe to make contact here. Will this give the R1+R2 value for the supply cable?

 

[GaryM]

Have you ever done an R1+R2 test before? Do you understand the principle and reason why a R1+R2 test is carried out?
Above, both Tony and I have explained how to do it, being one of the more basic tests and you still don't seem to grasp it.
Do you have a copy of Guidance Notes 3?

 

[Guitarist]

Of course I know how to do R1+R2 test! R1 requires a line connection and R2 an earth connection, where do i find these in the CU2 as it is been fed by the Main DB1? Am I right to assume that the point of contact between the line feeding the CU2 (R1)and the MET in the CU2 (R2)?

Thanks again.

I'll shut up then...

 

[nazoom]

Thanks Tony.
So in DB2 there is an RCD but no mains switch, do i treat this RCd as the main switch or do I just disconnect the conductors feeding this RCD ( which are the Line and Earth coming from DB1) and carry out R1+R2 on these conductors?

Many thanks.

 

[nazoom]

Thanks Tony.

So in DB2 there is an RCD but no mains switch, do i treat this RCd as the main switch or do I just disconnect the conductors feeding this RCD ( line) and Earth coming from DB1 and carry out R1+R2 on these disconnected conductors? Also linking in the DB1.

Many thanks


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[needasparks]

Only just seen this thread and can't really add to what the others have said as it is such a basic test but reading your OP again I'm not sure whether the confussing part is your supply to DB2. Is this from an MCB way of DB1 or from the same origin of DB1 ? as you say from the main switch. Does this mean you have doubles tails in the main swtch ?
A picture can help alot with these basic questions so people can get their heads round it and advise.

 

[GaryM]

He said that CU2 is a final circuit fed from an MCB in DB1.
i've explained as much as I can and asked questions which he's failed to answer so I'm not sure how I can help anymore.

 

[nazoom]

The Sub fuse is the first circuits in the DB1. There is a conductor connecting from this first sub fuse in DB1 to feed the DB2. This Conductor (Line) terminate in the RCD (Which is the first thing in DB2. Then this DB2 has two circuits protected by this RCD. In DB2 there is also Small MET and small Neutral terminal.
The confusion part is where do the probes go when measuring continuity (R1+R2) for the sub fuse feeding the DB2? I know I have to link this Line and cpc in DB1, but then where do the probes go in DB2 to measure R1+R2 for this sub fuse?

 

[GaryM]

Look above, both Tony and I have explained how to carry out a R1+R2 test in this case, which is no different to any other radial circuit.

 

[Des 56]

I know I have to link this Line and cpc in DB1, but then where do the probes go in DB2 to measure R1+R2 for this sub fuse?​

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I am going to have a crack :ihih:

Wherever the ends (live and earth)are connected in DB2, that is where you get R1+R2
Shove a crocodile clip on the earth bar and your probe wherever the live is terminated

 

[nazoom]

Thanks Des 56. That's all I wanted to know is where the probes connect to in the DB2 to measure R1+R2.

Thanks to all.

 

[RogertheBodger]

Well done Des! must be the way you tell em.

 

[Des 56]

Well done Des! must be the way you tell em.

I think its like that old saying,"the blind leading" and all that :blush5:

 

[Guitarist]

I really can't believe how convoluted a simple R1+R2 test became.
It would have been quicker to get an electrician involved though