Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 62 replies
  • Subscribers 32 subscribers
  • Views 7961 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Grid switch ratings enquiry

Farmboy
Had an interesting chat with a tech dept this afternoon after coming across some grid switches in a domestic kitchen.


Four grid switches (sharing a common backbox) are each fed via their own 16A cb's, and each feeds 1G sockets (for a cooker hood, fridge freezer, etc). Ignoring the cable sizes (the focus being on the grid switches), given the 13A plug fuses limits the loads in each cct, would you have the current rating of the grid switches equal to or higher than the 16A cb's (e.g. 20A), or lower (but equal to or higher than the socket rating e.g. 13A/14A)?


F
Parents
  • 0

    Chris Pearson:




    gkenyon:

    No-one would make the same statement about a 4-way (or 6-way or 10-way) "extension" with a 13 A plug, now, would they?




    That's completely different - the total output is limited by the fuse in the plug, and possibly another one in the sockets.


    MK make a triple 13 A fixed socket, but they are collectively fused in the same way by a BS 1362 fuse. Their literature specifies a rating of 13 A for singles and doubles, but 13 A total for triples. It does not say 13 A total for doubles.


     




    The MK Logic Plus double socket-outlets I have here, are rated "13 A" in just the same way as the other double socket-outlet I posted earlier. That is, 13 A total.


    The rating does not say "2 x 13 A" or "2 no. 13 A", it is marked with the total rating in the same way as the single socket-outlet.


    As Andy says, it's about "reasonable chance of an overload".

Reply
  • 0

    Chris Pearson:




    gkenyon:

    No-one would make the same statement about a 4-way (or 6-way or 10-way) "extension" with a 13 A plug, now, would they?




    That's completely different - the total output is limited by the fuse in the plug, and possibly another one in the sockets.


    MK make a triple 13 A fixed socket, but they are collectively fused in the same way by a BS 1362 fuse. Their literature specifies a rating of 13 A for singles and doubles, but 13 A total for triples. It does not say 13 A total for doubles.


     




    The MK Logic Plus double socket-outlets I have here, are rated "13 A" in just the same way as the other double socket-outlet I posted earlier. That is, 13 A total.


    The rating does not say "2 x 13 A" or "2 no. 13 A", it is marked with the total rating in the same way as the single socket-outlet.


    As Andy says, it's about "reasonable chance of an overload".

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines