Page 22
Electrical Connections
54400_install.fm
Section 1
Hach recommends conduit for two reasons:
1. It is generally required by most local electrical codes.
2. Use of metal conduit can improve immunity to lightning surges and
AC power transients.
Additionally, electrical and instrumentation standards require a local means of
removing power from the product. The instrument is supplied with a
power on/off switch that is located inside the instrument enclosure.
To remove relay power from the instrument, an external customer-
supplied 5A fused switch or a 5A breaker is required.
In hard-wired electrical applications, the power and safety ground service
drops for the instrument should be no longer than 6 meters (20 feet) unless
metal conduit is used to shield the AC power wiring. The wire should be 18 to
12 AWG.
In applications where power cords are allowed by local electrical codes and
power surges and transients are not a great concern, a sealing-type strain
relief and power cord with three 18 gauge conductors (including a safety
ground wire) can be used. See Figure 9 for strain relief assembly. The length
of the power cord must not exceed 3 meters (10 feet).
Figure 9 Assembling the Optional Power Cord Hardware
Description Catalog Number
115 V Power cord with strain relief 54488-00
230 V Power cord with strain relief 54489-00
Wall section of the
instrument enclosure.
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