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Re BS Standards for Distribution boards and Enclosures

Ian Stokes

Hi there 

I've recently been involved in a project to look at replacing old Distribution Boards and there Enclosures but we have been asked a number of questions in regards this these being as follows:-

Question 1 - Determine the impact to using the present array of MCB's within the current Distribution boards which are some 30-40 years old in line with what the current standards BS EN 61439-3 compared to the old Standards BS EN 60439-3?

Question  2 - What criteria determines if we do or don't need to use RCD's/RCBO's?

Question 3 - Can you swap the actual MCB's that are used in the current Distribution boards which are 30-40 years old with the latest new standard MCBs without changing the entire board?.

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    Distribution boards aren't cheap, nor are their sub circuit protection componants. We have old square D boards installed in the early 90s and we just obtain the Schneider equivalent if we need to add or alter a circuit to bring it in line with current standards.BS7671 will determine whether or not you need to change the likes of a mcb to a rcbo, or in the case of three phase circuits, just ad RCD protection via an external enclosure adjacent to the dist board.

    Question 1 is rather vaugue - what are you defining as 'impact'? Number of spare ways left? Future capacity/loading?

    Question 2 - the answer is the requirements of BS7671 which you should be familiar with if you are undertaking this kind of work.

    Question 3 the answer is yes if available and the board/range isn't obsolete.

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  • 0

    Distribution boards aren't cheap, nor are their sub circuit protection componants. We have old square D boards installed in the early 90s and we just obtain the Schneider equivalent if we need to add or alter a circuit to bring it in line with current standards.BS7671 will determine whether or not you need to change the likes of a mcb to a rcbo, or in the case of three phase circuits, just ad RCD protection via an external enclosure adjacent to the dist board.

    Question 1 is rather vaugue - what are you defining as 'impact'? Number of spare ways left? Future capacity/loading?

    Question 2 - the answer is the requirements of BS7671 which you should be familiar with if you are undertaking this kind of work.

    Question 3 the answer is yes if available and the board/range isn't obsolete.

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