Phonetics Skymetry WTU-14, Руководство пользователя

Страница: 33 / 114

Wiring Recommendations
The Skymetry WTU-14 will work fine in indoor environments
using unshielded cable. When wiring will be subject to long lengths
(>100') or if run outdoors, it is highly recommended that shielded
cable be used and that the shield be connected to an earth ground.
This is particularly important for sensor wires that are run in con-
duit with other noise-generating conductors, such as 60Hz AC. It is
strongly recommended that input wiring be run in a conduit separat-
ed from AC power or output wiring. When wire runs are long or are
in close proximity to large power consuming, power generating, or
power switching equipment, it is highly recommended that shielded
wire be used.
Also, be sure to use the appropriate gauge wire based on the dis-
tance and sensor type. See chart below:
Wire Gauge Thermistor NO/NC Contact & 4–20mA
#24 250' 1000'
#22 500' 2000'
#20 1000' 4000'
#20 1000' 4000'
When preparing wire for connection to the terminal blocks, strip
1
⁄
4
"
of insulation from the conductor (see figure below).
Figure 12: Wire stripped for connection
NOTE : All wiring should comply with Section 17
of the UL requirements.
Chapter 2: Installation
33