[Marcolao]

marcolao said:

Hi, I

got a problem and seeking for help, could anyone do me a favor.

 

The

power supply of network data centre is supplied by a UPS. The UPS’s output

connects to 2 nos. of 800A MCCB individually. And the circuits are protected by:

( Form 

 >>   to )

 

A)    800A MCCB  >> 

100A MCCB  >>  100A AI switch  >> 

( circuit 1 & 2 )

 

1)     63A Type C MCB  >> 

63A AI switch  >>  32A RCBO 

>>  Power socket  

2)     63A Type B MCB  >> 

Floor box (40A RCCB + Power socket)

 

B)     800A MCCB  >> 

100A MCCB  >>  100A AI switch  >> 

63A Type B MCB  >>  Floor box (40A RCCB + Power socket)

 

The case is that, a fault occurred at data server that

supply by the power socket of circuit A(1). The 32A RCBO was

tripped. When I tried to reset the RCBO, it tripped again immediately. At the

mean time, an unpredictable scenario was happened. Some RCCB (around 6 nos.) at circuit A(2) and circuit B were tripped at

the same time immediately. That caused around 7 nos. of servers were downed. Could

anyone do me a favor to give a hint? Thanks you so much.

---

No MCCB or MCB was tripped, only the the RCCBs were
affected. That caused around 7 nos. of servers downed. Finally, a fault
equipment at circuit A(1) had been isolated, and all circuits had been reset.
My question is that ;

1) Why the other RCCBs at the final circuit of the
separated circuits were tripped during I reset aforesaid  RCBO?

2) How the fault affect separated circuits?

[Author]

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