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EMC Symmetrix DMX-3 Product Guide
Planning and Installation
Symmetrix touch current compliance
The Symmetrix DMX-3 system bay and the storage bay power
supplies should not be connected on the separate Main and
Auxiliary circuit panels to differential trip devices. These devices
are typically called GFCI (Ground Fault Circuit Interrupter), GFI
(Ground Fault Interrupter), ELCB (Earth Leakage Circuit Breaker),
or Residual Current Circuit Breakers.
The Symmetrix systems are designated as fixed (stationary) electrical
equipment with high earth-leakage markings. The intention is to
connect the cabinets to the customer AC supply with the
recommended rated current breakers. “Electrical specifications and
power requirements” on page 270 for recommended circuit breaker
ratings) and the attached cables. These recommended breaker ratings
are based on the maximum kW loading of the cabinet and not on the
kVA figures of a particular configuration. The kVA values listed in
this product guide “Power and cooling data” on page 269 are
intended for air conditioning and utility loading purposes only.
Because the Symmetrix systems are high earth leakage devices,
differential trip devices (typically 30 mA) are not recommended due
to random activations during utility feed distortions and powerline
transients interacting with the cabinet emi noise filters.
These differential devices can be called GFCIs (Ground Fault Circuit
Interrupters), GFIs (Ground Fault Interrupters), ELCB (Earth Leakage
Circuit Breakers), or other names but typically have trip ratings of
5 mA to 500 mA and are mostly intended for consumer goods rather
than fixed devices.
If the Symmetrix bays are correctly grounded to the customer’s AC
power source, leakage current should not produce a voltage leading
to electrical shock. Serious insulation breakdowns should trip the
breakers feeding the cabinet or, preferably, should first clear fuses in
individual internal modules closest to the fault.
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