Vaisala WXT520 - Manual (Page 41)

Chapter 4 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 39
The kit does not include the grounding cable. Use a 16 mm
2
(AWG 5)
conductor to achieve a good ground connection.
Figure 16 Grounding Using the Bushing and Grounding Kit
Marine Grounding Jumper
The WXT520 should be properly grounded also in marine applications.
If it is grounded to the hull of a ship (ship’s ground) you must remove
the grounding jumper inside the WXT520. When the jumper is
removed, the signal ground is DC isolated from the chassis ground
(> 500 VDC, fulfilling the marine EMC specifications), but AC surge
currents will still be flowing, thus helping the WXT520 survive
transient overvoltages.
The jumper is located inside the transmitter, on the same component
board as the screw terminals. The location of the jumper is indicated in
Figure 17 on page 40 .
The following numbers refer to Figure 16 on page 39 :
1 = Fixing screw
2 = Nut
3 = Abiko connector between two washers