Electrical Conduit Requirements For Scale Wiring - Rice Lake Survivor SR2411-SC-60 User Handbook Manual

Electrical Conduit Requirements for Scale Wiring

Typical Example of Conduit Runs on 70' x 14' Scale
Junction Box Location Determined by LC Cable Lengths
Galvanized Metal Conduit
Flexible Rubberized Conduit
Load Cells to Junction Box
Each load cell is equipped with 60' of load cell cable. This length is sufficient to reach a centrally-located
junction box on all standard scales. A watertight LB right-angle connector and 30" of 3/4" flexible conduit
is supplied for each load cell. At the junction box, watertight conduit connectors and 30" flexible conduit
sections are provided for each of the conduits runs. Main conduit runs between these 30" flexible sections
are to be 3/4" galvanized metal conduit obtained locally.
Junction Box to Indicator
6-wire homerun cable is run in 3/4" galvanized metal conduit from the junction box to the indicator. 60' of
homerun cable is supplied. A 30" flexible conduit section and watertight conduit connector is provided
where this cable exits the junction box. Galvanized metal conduit is to be obtained locally.
Indicator to Peripherals
All conduit for cabling to peripheral devices is the responsibility of the installer to obtain locally.
Single-Point Ground Conductor
As noted in the previous section, a bare 10 gauge solid
wire is to be run underground from the grounding lug
on the junction box to the main AC power earth
ground. If the optional DC transient protection board is
installed as shown at right, the ground conductor
should also be attached to the transient protection
board's ground lug.
This bare ground cable is not to be run in conduit, but
should be buried to provide direct earth contact.
Cable Placement in Trenches
As a general guideline, run AC and DC cables in
separate trenches if possible. When DC load cell cables
must run in the same trench as AC power lines, sepa-
rate cables as much as possible to avoid interference.
See the scale installation manual for additional details.
Trench Conduit to Indicator and AC Power Supply
Trench #10 Conductor to AC Power Supply Ground Rod
DC protection board
TO INDICATOR
Ground Lug
10 ga. Bare Ground Wire
13
To DC Protection Ground
Connection before Indicator