uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members

Discuss Robin De-lock Loop Tester in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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

Hi all,
Just wondered if someone could tell me why my Robin Loop Tester with de-lock will only test through BS4293 Rcds? As soon as I use it on a 61008 or 61009 it will trip it?
I do normally use a megger with de-lock and its fine, but I like to use the robin for industrial/commercial tests.
 
Aico Carbon Monoxide Detectors
This official sponsor may provide discounts for members
M

MarkieSparkie

Robin's D-lock method of ELFI testing attempts to desensitise the RCD by swamping it's mechanism with DC 'blocking' voltage as part of the high current loop test pulse. This method works with BS4293 RCDs, but the newer BS EN 61009 types are much more testing-sensitive and D-lock is very often not effective.
Megger have never used the DC blocking method as it was covered by Robin patent. Initially Megger used a variation of the now common single pulse low current (15mA) EFLI test method which injects a current below the residual trip current of the RCD. Later this was superseded by their patented low current multi-pulse method that is much less sensitive to electrical noise.
 
  • Thread Starter Thread Starter
  • #3
Shame, as I have always liked the robin, on an old rcd, it tests instantly and gives 'true' results with its 20A test, oh well Il keep it for the industrial stuff then!
 

Reply to Robin De-lock Loop Tester in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

Electrical2Go - Online Electrical Supplier
This official sponsor may provide discounts for members
Top Bottom