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Topic Title: Position of devices for overload protection
Topic Summary: Position of switches
Created On: 11 August 2015 05:38 PM
Status: Read Only
Linear : Threading : Single : Branch
 Position of devices for overload protection   - 20did99 - 11 August 2015 05:38 PM  
 Position of devices for overload protection   - AJJewsbury - 11 August 2015 05:47 PM  
 Position of devices for overload protection   - 20did99 - 11 August 2015 05:50 PM  
 Position of devices for overload protection   - johnboy6083 - 11 August 2015 07:12 PM  
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 11 August 2015 05:38 PM
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20did99

Posts: 12
Joined: 24 June 2012

Hi all,

I am looking for some advice with the above regulation (433.2).

I am sure we have all heard of the 3m rule when it comes to overload protection. But I have some issues, let me give you an example.

Busbar system being supplied with 95mm 200a supply. From the BB there is DB being supplied with 25mm 6491X cable and there is no overload protection. Regulation 433.2.2 states that overload protection can be installed upstream depending if it is within 3m of where the reduction in current capacity of the cable has occurred.

So to rectify this I would change the main switch of the DB from a BS 60947-3 to a BS 60898. Problem solved.

But here comes my issue - (and the position of the protective device has neither branch circuits nor outlets for current using equipment). Surely a DB has branch circuits, or do they mean something else?
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