Distribution panel design

Distribution panel design

  • Panel design

    Votes: 3 60.0%

  • Panel design

    Votes: 2 40.0%
  • Total voters
    5
  • Poll closed .
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elmorseyma

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Hi all

panel has main CB is MCCB 3 Pole and the distribution is single phase MCBs 1 pole then the rating of MCCB is related to the rating of MCBs or related directly to the total load consumed from panel completely.

on the other words: if I have panel contains 30 MCBs 16 Amps each then now we can calculate MCCB rating or we need the load drown from panel.
 
If I understand the question, you go by the load, and not the breaker ratings.

I think the poll is a bit biased.
 
lol thats pretty confusing calling branch circuit breakers MCB'S and sizing them 16A each.

but as Larry said size your Main Circuit Breaker according to the load drawn. not from the panel but from the loads.
 
panel has main CB is MCCB

panel has main CB is MCCB

Thanks LarryFine, but said that there isn't relation between rating of main MCCB and distribution MCBs in same panel.

another question, when we say panel 100KVA that mean power drown is 100KVA or the main CB is 100KVA (150Amps @ 380Volt L-L)
 
Thanks, but you confirm that there isn't relation between main MCCB and branch MCBs (1).

(2) another question, when we say 100KVA panel then we mean the drown power from panel is 100KVA or the main CB of panel is 100KVA (150Amps @ 380Volts L-L)
 
Designer69 said:
lol thats pretty confusing calling branch circuit breakers MCB'S and sizing them 16A each.
Click to expand...
I guess MCCB is the main and MCB is the branch.

16 and 32 are common non-American breaker ratings, especially in the 240v systems. The typical service has but a single non-grounded condutor, and every load is line-to-neutral. Larger services have two or three lines, and they're Y systems with 'real' neutrals.

(I've asked a few questions.)

One thing that's always struck me as non-intuitive is the use of blue and brown insulation. It seems that the line conductor would be blue (like the sky) and the brown would be ground (as in the earth). But nooooooo. :smile:
 
the distribution panel boards are defined by the number of ways they have, may be 12 or 36 or 42 ways, these ways represent single or three phase loads and have MCB's double or three pole, so the ways protected by MCBs and the panel board protected by MCCB, which its trip value calculated based on the demand load of this panel-not the connected load- as seen by the feeder fed this panel. if the panel borad named by 100 kVA this mean the current drawn by each phase = 152 amp.(@380V, L-L voltage), then the triping value of MCCB is 200 amp. based on the MCCB inside encloser.

regards,
M.K. El atyar
 
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