L1, L2, L3 and N Main Busbar Arrangement in LV Switchboard

N：nearest

L3：near

L2：middle

L1：far

Dear Gradually,

Any write up or technical notes or technical specs or whatsover reference to this arrangement?

from chinese standard（国标）

Do you know any big brands of Switchboard (like ABB, Siemens, Schneider, etc...) is following this standard way of doing their busbar arrangement?

Actually i need some written documents to convince one of my clients.

Appreciate!!!

some of ABB, Siemens.N,L1,L2,L3(from inside to outside)

What does the Client want?

the client wants L1, L2, L3 & N from front to rear. i am trying to convince him that our practice of the reverse way is also ok and need to support my statement perhaps with reference to some big names... that will be much more convincing

Provide the Client with what he/she is prepared to pay for, subject to its being safe.

Busbar arrangement:

A, B, C (or 1, 2, 3) from left to right, front to back, top to bottom as viewed from front side.

Reference Standard:

ANSI C37.20.1 Section 7.1.1.1

NEC 430.97 (B)

- MS

Dear Sir,

I found this statement also in the internet, but my case is with neutral unlike what happen in the most MCC

Phasing is often driven by the switchgear chosen, e.g. using an ABB or Schneider 4 pole Air Circuit Breaker, N will be on left (looking from front) i.e. N, L1, L2, L3. Terasaki ACB will be L1, L2, L3, N again looking from front. Your choice, both are correct, if marked, as stated above.