Specifications

Chapter 5: General Installation Guidelines
Electrical Wiring
(12/99)
5-25
Home Run Cable Lengths
The maximum length of a home run cable varies with its conductor size (24
gauge, 20 gauge, or 16 gauge) and the type of indicator being used. You can
increase the maximum length by using cables with larger conductors (Note: 16
gauge is larger than 24 gauge). If a cable exceeds the recommended length, it
will cause a voltage drop that could affect weight readings.
Table 5-1 lists recommended maximum cable lengths for METTLER TOLEDO
Jaguar®, Lynx®, LynxBatch®, and Panther® indicators. The maximum cable
length is based on total scale resistance (TSR), which is the load cell input
resistance (ohms) divided by the number of load cells. Panther, Lynx, and
LynxBatch indicators can be used with as many as eight load cells. A Jaguar
indicator can be used with as many as ten load cells.
The recommended maximum cable length for a Puma® indicator with one to four
load cells is 400 feet for 22-gauge cable or larger.
Number of
Load Cells
TSR
(ohms)
24 Gauge
(feet)
20 Gauge
(feet)
16 Gauge
(feet)
1 350 800 2,000 4,000
3-4 117-87 200 600 1,000
6-8 58-44 100 300 500
10* 35 70 190 350
*Jaguar indicator only.
Table 5-1: Recommended Maximum Home Run Cable Lengths
We recommend using a dual-shield cable design to protect the signal from
electromagnetic and radio frequency interference. A cross section of this type of
home run cable is shown in Figure 5-31.
Figure 5-31: Cross Section of Dual-Shield Home Run Cable
1
2
3
4
5
6
Polyurethane JacketConductor
Filler
Binder
Shield Separator
First Shield
RFI/EMI
Second Shield
Ground