Appendix B: Pre-Installation Considerations: Electrical Power
Operation Manual: Evolution Series
Appendix B : Pre-Installation Considerations: Electrical Power
Supply
1. Locations using 115V, 60-cycle AC should provide a separate 20-A circuit for each
Distek Evolution Dissolution System that they intend to install. In cases where
additional modules (sampling, monitoring, and printing) are being installed, separate
20-A circuits are necessary.
2. Similarly if 220V, 50 cycle AC systems are being installed, each system should be wired
to a separate 15-A circuit.
3. Because of the extensive use of microprocessor technology, it is recommended, where
possible, that 12-gauge stranded-copper wiring be used for all circuit wiring. In cases
where the distance from the circuit breaker sub-panel to the outlet exceeds 500 feet
(150m), 12-gauge wire is the minimum that should be used. The use of larger
diameter wiring reduces the voltage drop in the wiring, helps reduce power
consumption, and increases the inductive impedance of the circuit which helps smooth
voltage fluctuations.
4. In addition, if possible, an isolated ground wire should be used and the site should be
wired in a 3-phase, 4-wire configuration with an approximate load balancing among
the phases. In sites where many systems are being installed, the number of systems
wired to each phase should be balanced as much as possible.
5. To minimize the risk of damage to a system from electrical system problems:
5.1 Verify that the power wiring configuration is proper.
5.2 Verify that the mains voltage (“supply” to “neutral”) is within 7% of the nominal
supply voltage.
5.3 Verify that the common-mode voltage between “neutral” and “ground” is: less
than 2.0 V AC in 115V AC installations or less than 3.0 V in 230V AC installations.
5.4 If possible, verify the current dissipation capacity of the “ground” and the
“neutral” lines in the circuit wiring.
5.5 Building mains should be protected with “lightning suppressors” and, ideally, each
circuit should be terminated by the appropriate “surge protection” receptacle. (In the
United States, suitable receptacles are supplied by Hubbell, Inc. Alternately, a sized
computer-grade surge-suppression accessory with the appropriate current rating can be
added to existing circuits.)
5.6 For those users who require protection from voltage drop-outs, short term power
interruptions, and supply voltage reductions, a suitable standby Uninterruptible Power
Supply (UPS) should be installed between the supply and the dissolution system.
5.7 For those sites whose power quality is compromised either by the nature of the
generation source or imposed fluctuations and pulses, an isolation transformer or an
on-line UPS may be needed.
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