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 17 replies
  • Subscribers 32 subscribers
  • Views 1663 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

sub-DB reading higher than feeder DB

Former Community Member
Former Community Member

Hi,  I have a main distribution board which feeds into a sub-distribution board.  This sub board then feeds into two buildings.  Via a cable into the one building and also via a cable into another distribution board in the second building. What is puzzling me is that the distribution board in the second building shows a higher consumption than the main board which supplies it.  Does anyone have an idea how this could be possible? Thanks very much, Nick

Parents
  • 0

    If the main meter is installed by the power company for billing purposes, then that is more likely to be correct, they are experts in this sort of thing and generally get it right.

    Mistakes have occurred but are relatively rare, and are very rare indeed on a simple domestic sized install.

    My earlier remarks listed various possibilities for error on large, 3 phase industrial supplies, such as wrong ratio current transformers, blown voltage fuse on one phase, current transformer installed wrong way around, etc. These are not applicable to a domestic sized install.

    Do be aware of the possibility that the suppliers meter might be in error. Most improbable, but not impossible.

Reply
  • 0

    If the main meter is installed by the power company for billing purposes, then that is more likely to be correct, they are experts in this sort of thing and generally get it right.

    Mistakes have occurred but are relatively rare, and are very rare indeed on a simple domestic sized install.

    My earlier remarks listed various possibilities for error on large, 3 phase industrial supplies, such as wrong ratio current transformers, blown voltage fuse on one phase, current transformer installed wrong way around, etc. These are not applicable to a domestic sized install.

    Do be aware of the possibility that the suppliers meter might be in error. Most improbable, but not impossible.

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