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 10 replies
  • Subscribers 32 subscribers
  • Views 577 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Fridays rumination

Johno12345
I have been thinking (yes, smoke has been rising)


I'm not an electrician, but  am in charge of our facility and have a decent knowledge of how things work



Anyway, I want to have some distribution equipment replaced due to the age and condition of it.


I always specify Schneider Acti 9 boards or Powerpact 4 boards


These boards wont require anything bigger than 63a 3ph, so ill be ok with an Acti 9 board, but the total load is likely to be around 200 amps over an 18 way board. I was thinking that sounds a lot to put through a DB as a continuous load, but the website implies that its going to be fine. Is this right? I'm visualising a heating effect etc, so what point do you stop with a DB and go to a panelboard? Usually, if I need to supply something larger than 63a, I know ill need to have a panel board and can budget accordingly


Anyway, as I said, I'm just thinking out loud in preparation for budgeting
Parents
  • Former Community Member
    0 Former Community Member
    Personally speaking, I tend to limit Distribution Boards to a maximum of 250A, and more usually Typical Type B final circuit distribution to 125A.


    For switchgear busbar ratings between 250A and 630A, I would tend to describe these as panel boards or Tier 3 Switchboards - not hard and fast, they could go to say 800A


    For busbar ratings between 630A and 1250A, I would describe these as switchboards or Tier 2 Switchboards - I tend never to exceed 1250A on this range as it's the limit on BS 88 fuses (often specified for assisting with arcflash protection at the front end of the board, even if the board uses MCCB's or smaller frame ACB's)


    Above 1250A, and for anything fed direct from a Transformer, these would be Tier 1 switchboards, usually all ACB's  - ampacity can easily go to 6000A and above.


    Regards


    OMS


Reply
  • Former Community Member
    0 Former Community Member
    Personally speaking, I tend to limit Distribution Boards to a maximum of 250A, and more usually Typical Type B final circuit distribution to 125A.


    For switchgear busbar ratings between 250A and 630A, I would tend to describe these as panel boards or Tier 3 Switchboards - not hard and fast, they could go to say 800A


    For busbar ratings between 630A and 1250A, I would describe these as switchboards or Tier 2 Switchboards - I tend never to exceed 1250A on this range as it's the limit on BS 88 fuses (often specified for assisting with arcflash protection at the front end of the board, even if the board uses MCCB's or smaller frame ACB's)


    Above 1250A, and for anything fed direct from a Transformer, these would be Tier 1 switchboards, usually all ACB's  - ampacity can easily go to 6000A and above.


    Regards


    OMS


Children
No Data

Community Rules & Guidelines