General about wiring and grounding, Cable bushings, General about wiring and grounding cable bushings – Vaisala PTB330 User Manual
Page 27
Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 25
General about Wiring and Grounding
Cable Bushings
A single electrical cable with screen and three to ten wires is
recommended for power and signal connections. The cable diameter
should be 8...11 mm. The number of cable bushings depends on the
barometer options. See the following recommendations for the cable
bushings:
Figure 15
Cable Bushings
Numbers refer to Figure 15 above:
1
=
Cable for signal/powering Ø 8 ... 11 mm
2 = Pressure
port
3
=
Cable for optional power supply/relay module Ø 8 ... 11 mm
NOTE
When there is high electric noise level (for example, near powerful
electric motor) in the operating environment, Vaisala recommends
using shielded cables or taking care that the signal cables are
separated from other cables.