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Topic Title: Reg 537.2.5
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Created On: 11 July 2018 04:03 PM
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 11 July 2018 04:03 PM
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briggsy6

Posts: 513
Joined: 24 September 2003

Is this right?

"Provision shall be made for securing off-load isolating devices against unwanted or unintentional opening"

That ought to be 'closure', surely?
 11 July 2018 04:24 PM
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OMS

Posts: 22583
Joined: 23 March 2004

Same as the current regulations then

Keep in mind "off load" - you most certainly wouldn't want some idiot trying to open that device on load - it's not design to make or break current - it's just an isolator

Regards

OMS

-------------------------
Let the wind blow you, across a big floor.
 11 July 2018 04:31 PM
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broadgage

Posts: 2800
Joined: 07 August 2007

Perhaps not.
If the device is intended for off load operation only, then opening it whilst carrying load current could have most unfortunate consequences. Therefore provision needs to be made to secure against any such devices against being opened on load.

From a practical point of view it may be noted that "off load isolating devices" are in practice largely confined to very high voltage switchgear in power stations and grid substations. "Isolators" in industrial and similar situations are almost always intended for operation ON LOAD and might more properly be called "load making and load breaking isolating switches"
 11 July 2018 05:07 PM
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mapj1

Posts: 10790
Joined: 22 July 2004

The key is the words 'off load' .
Really you don't want it closing or opening unless the load is de-energised from somewhere else , as if it will arc like a welder and and burst into flames if opened under load, then a snap crackle connection on to load is probably not a good idea either.

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regards Mike
 11 July 2018 06:42 PM
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briggsy6

Posts: 513
Joined: 24 September 2003

Cheers all.

My bad.

RTFQ, as it were... I was distracted while looking for something else.

Thanks for the replies!
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