Originally posted by: Badshah
how it can be physically verified?
Isolate and earth it. Issue a PTW, open the lid and have a look whist you operate the mech.
First thing to do is get a hold of the maintenance manuals (from the manufacturer and the network operator) for the switchgear - this will tell you; and also tell you how to operate and maintain the switchgear.
Note that the network operator's maintenance manuals may differ from the manufacturer's: the network operator will have devised their own maintenance plan for the switchgear.
The L&C ETV2 fuse-switch is independent, whilst the earth switch is dependent. If I remember rightly, there is a connecting rod between the open/close handle that when in the open position, allows the release of a 1" brass bolt so that the earth switch can only be operated dead. Over the years, this can mis-align (epsecially if someone has tampered with it or tried to defeat it), so double check this on your maintenance.
Western Power have all their switchgear instruction manuals on-line as pdfs...which is handy for you!
24 March 2014 at
11:59 AM by