M
markthespark
Hello i was wondering if anyone could help me out please.
I have worked as an Electrician for around 8 years now but have never been too familiar with testing.
I have decided to start working for myself and have chosen to join Elecsa.
But before i do that i need to brush up on my testing skills, and i remember it by using the CRIPPER method.
Can anyone recommend which Testing books to buy?
Continuity of protective conductors
- Equipitenial Bonding must be a maximum reading of 0.05 Ohms (Disconnect at meter end and connect wander lead to connection at gas or water and test resistance inbetween)
- Continuity of Protective conductors (r1 r2) On a lighting or Radial circuit connect L and CPC at CU and test between L and CPC at the furthest point
(is this correct? or should i be testing at every point on a lighting circuit?)
Ring Final Testing
Ring continuity - Test between L & L, CPC & CPC, N & N (L & N should be identical readings where CPC should be 1.67 X r1
Cross connect L & N on opporsite cables and test between L & N at every socket (should be the same) (Reading should be half of Ring continuity test) r1 + rn/4 =
Repeat between L & CPC. r1 + r2/4 =
Insulation Resistance
Am i right my saying to test insulation resistance on a lighting circuit with transformers/dimmers in the circuit, i should test L & N together between CPC and record on the test sheet as LIM?
Also when testing a circuit with no sensitive equipment what is the min ohm reading that is considered acceptable when testing insulation resistance?
Polarity
DEAD - When testing for polarity on a lighting circuit do you have to connect L & CPC at the CU and test between L & CPC at every switch, similar to the r1 r2 test?
LIVE - What is the correct method for testing for polarity on a live lighting circuit? or other radial circuit such as a shower circuit?
Many Thanks in advance.
I have worked as an Electrician for around 8 years now but have never been too familiar with testing.
I have decided to start working for myself and have chosen to join Elecsa.
But before i do that i need to brush up on my testing skills, and i remember it by using the CRIPPER method.
Can anyone recommend which Testing books to buy?
Continuity of protective conductors
- Equipitenial Bonding must be a maximum reading of 0.05 Ohms (Disconnect at meter end and connect wander lead to connection at gas or water and test resistance inbetween)
- Continuity of Protective conductors (r1 r2) On a lighting or Radial circuit connect L and CPC at CU and test between L and CPC at the furthest point
(is this correct? or should i be testing at every point on a lighting circuit?)
Ring Final Testing
Ring continuity - Test between L & L, CPC & CPC, N & N (L & N should be identical readings where CPC should be 1.67 X r1
Cross connect L & N on opporsite cables and test between L & N at every socket (should be the same) (Reading should be half of Ring continuity test) r1 + rn/4 =
Repeat between L & CPC. r1 + r2/4 =
Insulation Resistance
Am i right my saying to test insulation resistance on a lighting circuit with transformers/dimmers in the circuit, i should test L & N together between CPC and record on the test sheet as LIM?
Also when testing a circuit with no sensitive equipment what is the min ohm reading that is considered acceptable when testing insulation resistance?
Polarity
DEAD - When testing for polarity on a lighting circuit do you have to connect L & CPC at the CU and test between L & CPC at every switch, similar to the r1 r2 test?
LIVE - What is the correct method for testing for polarity on a live lighting circuit? or other radial circuit such as a shower circuit?
Many Thanks in advance.