Electrical2Go - Online Electrical Supplier
This official sponsor may provide discounts for members
Advertisement - Content continues below
Advertisement - Content continues below

Discuss Circuit Impedance in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

D

desertbootz

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

Taking over a building and starting to get PIR's for handover. They are NICEIC styley and under Circuit Impedence they have three columns for Ring and two for 'All Circuits'. The tester has filled in all columns for every cct but they don't make much sense, eg, 4mm line and cpc, R1=0.39, Rn=0.42, r2=0.50 which seems okay (allowing for meter error etc.) but then the 'All Circuits' column shows; R1+R2=0.14, R2=0.50.

How do you get an R1+R2 lower than the values of R1 and R2? Is he bluffing it or am I being a mong?

All advice/abuse received in the manner it's meant :O)
 
Aico 3000 Range
This official sponsor may provide discounts for members
Advertisement - Content continues below

old dog

-
Arms
hi i get r1+r2=0.22
the first readings he gives are r1 end to end the same for r2 and rn
with the r1 and r2 cross linked the reading at the sockets should be approx 1/4
r1+r2/4
 
D

desertbootz

  • Thread Starter Thread Starter
  • #3
Maybe I wasn't clear. I understand R1+R2 on the ring is measuring the conductors in parallel hence the lower reading but how/why would these readings be filled in for lights?
 
E

ezzzekiel

  • Thread Starter Thread Starter
  • #4
if you mean what i think you mean, then he has carried out a ring final cont test on a radial circuit - which is incorrect
 

Des 56

-
Arms
Esteemed
We should not assume the lights are radial
There are occasions for example, volt drop problems, where ring circuits for lights are installed
What does it say in the column for number of conductors for the circuit
(if the nic form has this column)
 
Aico Carbon Monoxide Detectors
This official sponsor may provide discounts for members
Advertisement - Content continues below

Reply to Circuit Impedance in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

CK Tools :) The professionals choice when it comes to Electrical Tools
This official sponsor may provide discounts for members
Advertisement - Content continues below
Top Bottom