R1 and R2

[stv292]

Hi, when testing R1 and R2 do you measure from the incoming live to earth or switch live to earth, thanks

 

[Ponty Massive]

Not quite sure what you mean there? By using the term switch live, I'm guessing you mean the R1 + R2 of a lighting circuit?

 

[rmc86uk]

Test between line and earth at every point on the circuit.

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[Deleted member 26818]

You have to join the earth and line conductors together, either at the board, or the end of line and then take the measurement at the other end.

 

[stansmith]

link at the board its safer by disconnecting at the db you wont accidentally leave a link on out in the field and turn the supply back on boom

 

[Deleted member 26818]

Also R1+R2 is supposed to bejust a measurement of the conductors of the circuit, not including any parallel paths, which there could very well be if a link was used to the earth bar.

 

[High Tower]

I think i know what you are referring to!!

When testing R1+R2 at pendants, you test from the earth terminal to the switched live, with the switch turned to the on position. So that way you are also testing both sides of the switch drop.

 

[stv292]

yes that is what i ment thanks as i was getting 2 different readings at the pentant on a lighting circuit and wondered which one was correct.

 

[rmc86uk]

yes that is what i ment thanks as i was getting 2 different readings at the pentant on a lighting circuit and wondered which one was correct.

Record the highest value.

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[theophilus]

Why do we have to operate two way switching during R1+R2 test?

 

[malcolmsanford]

So that you measure the strappers which should also done during the IR test as well

 

[theophilus]

Thank you Malcom.

 

[Deleted member 26818]

Why do we have to operate two way switching during R1+R2 test?

To prove polarity, and as Malcolm says, to include the longest conductor in the measurement.

 

[theophilus]

Thank you Spinlondon