Hach sc1000, User Manual

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14
Installation
3.4 Electrical Installation
DANGER
Only qualified personnel should conduct the installation tasks described in this
section of the manual.
DANGER
Always install a residual current circuit breaker (rccb) with a maximum trigger
current of 30 mA. If installed outside, provide overvoltage protection.
If installed outdoors, provide overvoltage protection between the power and the sc1000
controller system. Make sure the data and power cables do not cause tripping and do not
contain any sharp bends. Refer to
Figure 8 for housing breakout information.
High-voltage wiring for the controller is conducted behind the high voltage barrier in the
controller enclosure. The barrier must remain in place unless a qualified installation
technician is installing wiring for power, alarms, or relays. See
Figure 9 for barrier removal
information.
The instrument can be wired for line power by hard-wiring in conduit or by wiring to a
power cord if allowed by local electrical code. A local disconnect designed to meet local
electrical code is required and must be identified for all types of installation. See
Figure 10
and Figure 11 on page 16 and for suggested local disconnect configurations.
Do not connect the electrical power supply to the AC power until the sc1000 controller
system has been fully wired, fused, and the high voltage barrier and probe module cover
have been replaced.
3.4.1 Installation in Hard-wired Applications
In hard-wired electrical applications, the power and safety ground service drops for the
instrument must be 18 to 12 AWG. A sealing-type strain relief must be used to maintain
the IP65 environmental rating. See
Figure 7 on page 14 for strain relief and conduit
opening sealing plug assembly. See Figure 10 on page 16 for wiring information.
3.4.2 Installation Using a Power Cord
A sealing-type strain relief to maintain the IP65 environmental rating and a power cord
less than 3 meters (10 feet) in length with three 18-gauge conductors (including a safety
ground wire) can be used, see
Replacement Parts and Accessories on page 57 . See
Figure 7 for strain relief and conduit opening sealing plug assembly. See Figure 11 on
page 16 for wiring information.
Figure 7 Using the Optional Strain Relief and Conduit Plug
1. Strain Relief, small 2. Strain Relief, large 3. Conduit 4. Plug, sealing
1 2
4
3
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