NCR RealPOS 60, Site Preparation Manual

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Appendix A:
TransientProtection
AC Power Line Transient Protection
In the process of power distribution, transient electrical energy (including, but not
limited to, lightning strikes, intermittent short circuits, and switching transients) can be
introduced onto power lines. Such transient energy can be very damaging to electronic
hardware, and can also cause data corruption. Under these circumstances, NCR
recommends the use of AC power transient suppressors. Such protection devices are
intended to guard against power line transients that can result in hardware damage and
various system or program errors.
Improvement of any deficiencies in power quality is a customer responsibility.
Malfunction and/or component failure as a result of power quality problems are/is not
covered by the NCR Maintenance Agreement. NCR accepts no liability for any such
occurrence nor for its consequences.
When power transient suppression is required, the suppressors used should meet the
following minimum requirements:
• Dissipate energy to match the appropriate location categories as defined by IEEE
Standard C.62.41.2-2002.
• Be of the voltage limiting (clipping), or tracking filter type. The suppressor must not
clamp the voltage to zero, and must self-recover after the passage of the transient.
The suppressor may be of the hybrid type construction that makes use of various
technologies in order to meet speed and dissipation requirements.
• TranUpon failure, exhibit a positive indication of its failure such as a blown fuse or
tripped breaker.
• Be listed by the accepted safety organization for the country involved (UL, CSA,
VDE, ETL, and so on) and the installation must conform to local, state, and national
electrical