Discuss non trip loop test still trips the rcd in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

J

jools p

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

I have a megger 1552 and the no trip setting works fine, until today. Can't get a loop reading on a sub main in workshop. It keeps tripping the RCD back in the house. Some RCD's I have found to be ultra sensitive but not this one. Cutting cables all day on switched off circuits and never a trip but go and do the test and pop off it goes. Whats that all about..
 
Aico Carbon Monoxide Detectors
This official sponsor may provide discounts for members
S

Spudnik

  • Thread Starter Thread Starter
  • #2
Exactly as you said, some RCD;s are more sensitive then others.

I have just fitted a new GE budget CU today and none of it tripped once.

I have had crabtree and hager which sometimes trip and sometimes dont.

Make sure your probes are pushed in tight before and during the test. Sometimes if one is loose that will also cause them to let go.
 
J

jools p

  • Thread Starter Thread Starter
  • #3
This time i was using the plug attachment thingy though
 
W

WarrenG

  • Thread Starter Thread Starter
  • #4
I have a megger 1552 and the no trip setting works fine, until today. Can't get a loop reading on a sub main in workshop. It keeps tripping the RCD back in the house. Some RCD's I have found to be ultra sensitive but not this one. Cutting cables all day on switched off circuits and never a trip but go and do the test and pop off it goes. Whats that all about..
I take it you have RCD discrimination between house board and sub board?

Can't see how this would make a difference but it would be interesting to try the test in the sub board with the RCD in the house board isolated?

I have a Megger MFT 1552 silly question but your not using HI-Loop?
 
J

jools p

  • Thread Starter Thread Starter
  • #5
No, on the no trip setting. Never had it before.
 
T

Tiger

  • Thread Starter Thread Starter
  • #6
check your tester on a system you know to be ok. your house. that will tell you your testers ok.
Did you do a rcd nuisence trip test? see if the rcd's ok
 
uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members

Reply to non trip loop test still trips the rcd in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

Top Bottom