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Customer circuit breakers (CBs)
The following table shows the maximum circuit breaker ratings based on input
voltage.
It is recommended, for simplicity and ease of upgrades, that the circuit breaker
ratings in this table be used on all power cords for all installations. The actual
power drawn (heat load) by any configuration will not be affected.
Note: System z server design incorporates Electromagnetic Interference filter
42
z10 BC IMPP
Input Voltage Range (V)
200 - 240V
380 - 415V
480V
capacitors required to block electrical noise from penetrating the power grid.
A characteristic of filter capacitors, during normal operation, is high leakage
currents. Depending on the server configuration, this leakage current can
reach 350mA (350 milliamps). For most reliable operation, Ground Fault
Circuit Interrupter (GFCI), Earth Leakage Circuit Breaker (ELCB) or
Residual Current Circuit Breaker (RCCB) type circuit breakers are not
recommended for use with System z servers. By internal design and
grounding, System z servers are fully certified for safe operation (compliance
with IEC, EN, UL, CSA 60950-1).
However, if leakage detection circuit breakers are required by local electrical
practice, the breakers should be sized for a leakage current rating not
less than 500mA in order to reduce the risk of server outage caused by
erroneous and spurious tripping.
System Rated Current (A)
24A
16A
14A
Level 03c, May 2011
Circuit Breaker
30 amps
16 amps
15 amps
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