Jul 5, 2011 · Hi, i'm a little confused about the way to calculate the amp of the circuit breaker for a three-phase system. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. My calculation was 11500/(1.732x400) = 16.6 Amps per phase ... 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker.

Apr 29, 2015 · You first ensure the breaker is rated for the motor for both load and inrush, an indepth knowledge of motor starting systems and motor starting duties is needed. You then ask a lot of question about when it tripped.... as it started, while running etc.

Jun 30, 2015 · So I was wondering how do we choose circuit breaker for a three phase motor (lets say 6 kW, 400V, pf=0,8? We will need to calculate the current - I = P/ (sq.rt.3. x V x PF). So far so good. Now I'm getting a bit confused. This should give us the line current I = 10,83 A.

Apr 4, 2023 · Hi , Currently doing a design project in college and I need to pick a circuit breaker ( In device rating and type) for a food holding equipment unit that requires a 16A 400V three phase and neutral supply that is supplied by 5 core SWA. I think I should pick a 16A 3P+N RCBO but wasn't completely sure so thought I would run it by on here 1st ...

Jun 29, 2016 · Here’s another very similar scenario I’m considering: There will be a number of workbenches, each needing one three-phase socket and various single-phase sockets for portable tools, all in a group on a small panel. 16A TP MCB > TP 20A isolator > 16A 5-pin TPN socket (L1/L2/L3/N/PE),13A socket (L1/N/PE) and two 16A sockets (L2/N/PE and L3/N/PE).

Feb 17, 2022 · Hi, i'm a little confused about the way to calculate the amp of the circuit breaker for a three-phase system. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. My calculation was 11500/(1.732x400) = 16.6 Amps per phase ... 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker.

Aug 20, 2019 · So, I was filling out a test sheet for a number of 3-phase circuits we did an EICR on. For years whenever a 3-phase circuit exists I have recorded them on a single line (eg. 1/TP or 1/L123) and recorded the highest or lowest value applicable to that particular test regardless of phase. Something the NIC has never taken issue with.

Jun 21, 2012 · It's a three phase, 400v 6.4amp motor which outputs 2.2kW. I'm running from the Distribution board in swa to the control switch. My question is, what size of 3 phase Circuit Breaker should i install at the board?

Oct 18, 2023 · All the washing machines including those that are single phase have triple pole MCBs installed and wired in 5-core to 16A rotary isolator. from the same isolator a 5-core rubber flex is used and then of those five cores two of the phase L2 and L3 have been WAGO'd in the next single phase washing machine, exactly the same but L1 and L3 have been ...

Apr 14, 2012 · Chances are BS 60898 if it's a new circuit breaker you want . Reply. johnboy6083-Apr 14, 2012 #3