Overloaded fused spur, opinion please

gkenyon:

perspicacious:
This is the same question re Wago's ? Provided the terminals are sized for either 2x2.5 sq mm or 2x4 sq mm, surely there's not an issue here?


Until that is answered, there's no point in adding further asides unless a career in politics is looming?


Again, simply, are the INPUT/loop in terminals of a 20 A DP switch suitable for connection to a 32 A RFC irrespective of whatever is on the OUT terminals?


Regards


BOD

 

Provided the manufacturer's information shows that the conductor sizes for the terminals are suitable for 2 x 2.5 or 2x 4 sq mm, I don't believe there's a problem. Many of them are suitable for the same conductor configurations as BS 1363 accessories.


Is there any reason to conclude otherwise?


So, I checked - BS EN 60669-1 is being used for switches now, not the general standard BS 5733.


20 A switches are tested for temperature rise with a current of 25 A, which is broadly in line with the tests for BS 1363 accessories.

BS EN 60669-1 and BS 5733 are similar. For accessories > 16 <= 25 A, the terminals must accommodate 1.5 to 4 mm² (5733) or 2.5 - 6 mm² (60669-1) solid conductors. Whilst the terminals may accommodate more conductor, clearly it must still be possible to clamp the smallest one adequately. If a 60669-1 terminal can accommodate a 6 mm² conductor, it seems pretty obvious that it will accommodate 2 x 2.5 mm². Regarding looping in and out, or being placed in a ring, the rating is that of the switch. I see no reason why any terminal which will accommodate 2 x 2.5 mm² should not also safely carry the load (up to 27 A, RM C).


As Graham says, manufacturer's instructions are what count. Some 20 A switches may be inserted in a ring, some may not.


My preference is to spur off the nearest socket in 2.5 mm² and put the switch into the spur.


I would have no reservations about using Wagos of the appropriate rating in an appropriate enclosure. A back box would not be adequate for a fully loaded cable.

gkenyon:

perspicacious:
This is the same question re Wago's ? Provided the terminals are sized for either 2x2.5 sq mm or 2x4 sq mm, surely there's not an issue here?


Until that is answered, there's no point in adding further asides unless a career in politics is looming?


Again, simply, are the INPUT/loop in terminals of a 20 A DP switch suitable for connection to a 32 A RFC irrespective of whatever is on the OUT terminals?


Regards


BOD

 

Provided the manufacturer's information shows that the conductor sizes for the terminals are suitable for 2 x 2.5 or 2x 4 sq mm, I don't believe there's a problem. Many of them are suitable for the same conductor configurations as BS 1363 accessories.


Is there any reason to conclude otherwise?


So, I checked - BS EN 60669-1 is being used for switches now, not the general standard BS 5733.


20 A switches are tested for temperature rise with a current of 25 A, which is broadly in line with the tests for BS 1363 accessories.

BS EN 60669-1 and BS 5733 are similar. For accessories > 16 <= 25 A, the terminals must accommodate 1.5 to 4 mm² (5733) or 2.5 - 6 mm² (60669-1) solid conductors. Whilst the terminals may accommodate more conductor, clearly it must still be possible to clamp the smallest one adequately. If a 60669-1 terminal can accommodate a 6 mm² conductor, it seems pretty obvious that it will accommodate 2 x 2.5 mm². Regarding looping in and out, or being placed in a ring, the rating is that of the switch. I see no reason why any terminal which will accommodate 2 x 2.5 mm² should not also safely carry the load (up to 27 A, RM C).


As Graham says, manufacturer's instructions are what count. Some 20 A switches may be inserted in a ring, some may not.


My preference is to spur off the nearest socket in 2.5 mm² and put the switch into the spur.


I would have no reservations about using Wagos of the appropriate rating in an appropriate enclosure. A back box would not be adequate for a fully loaded cable.