Tower Lightning Protection
Sensor Line Lightning Protection
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| 190-122 Tower Grounding Kit | 350-B480-24V Sensor Line Surge Arrestor |
Electrical surges due to lightning are common sources of sensor and data acquisition equipment failure. The lightning protection packages described below improve the likelihood of continued functioning of equipment exposed to frequent lightning storms, and these packages are highly recommended for systems in such locations. Protection against a direct lightning strike, of course, cannot be guaranteed.
Tower grounding kits use ground rods and copper cable or copper strips to conduct any electrical charges due to lightning directly to the ground. In the 190-121, a straight ground rod is mounted to the tower leg at the top of the tower. The 190-122 provides an angled rod, for use when wind sensors will be mounted on top of the tower. The 190-120 does not use a top-mounted ground rod, but uses 25 foot by 1-1/2" copper strips, clamps, and ground rods attached to each tower leg. The 190-110 is a low cost grounding kit designed for use with a tripod. Mounting hardware is included with each package. Ground cable must be ordered separately, except for the 190-110.
AC power lines to the junction box and to instruments on the tower are protected by the 350-1077 and 350-1077-A Secondary AC Power Surge Arrestors. When a surge occurs, these devices divert it to earth ground and immediately self-restore. The 350-1077 and 350-1077-A must be mounted in a junction box.
Sensor line surge arrestor packages protect the sensor signal lines and dedicated or switched telephone lines. Each package utilizes a two-stage transient suppressor. When a surge occurs, a zener diode clamps the voltage (24 Vdc) at a safe level and series resistors absorb the remainder of the voltage. A gas discharge tube is activated if the voltage is greater than 150 Vac. These components absorb the bulk of the transient and discharge it to earth ground. After the transient passes, the entire circuit recovers automatically. The 350-B380-24V protects four lines and the 350-B480-24V protects eight lines. Screw terminals are provided for input and output connections. These line arrestors are normally mounted in a junction box.
NovaLynx offers customized packaged units consisting of a junction box, surge board, ac protection, fused 115 Vac input/output circuits, ground rod, and ground cable. Consult the factory for a quotation.
Ordering Information
190-110 Tripod Grounding Kit; 1 ground rod, clamps, 5' wire #4AWG
190-120 Tower Grounding Kit; 1-1/2" copper strips, clamps, and ground rods attached to each tower leg
190-121 Tower Grounding Kit; includes 2 ground rods and mounting hardware. Requires 330-T605004 Ground Cable.
190-122 Tower Grounding Kit; includes 1 angled ground rod, 1 straight ground rod, and mounting hardware. Requires 330-T605004 Ground Cable.
330-T605000 Ground Cable, #4 copper, PVC jacket
330-T605004 Ground Cable, 2/0 bare copper, for use with tower lightning protection kits. Length should equal the height of the tower plus the distance to the ground rod.
330-T713018 Ground Rod, copper plated, 8 feet
350-1077 Secondary (Junction Box) AC Power Surge Arrestor, 115/230 Vac
350-1077-A Secondary (Junction Box) AC Power Surge Arrestor, 220-277 Vac
350-B380-24V Sensor Line Surge Arrestor, for 4 lines
350-B480-24V Sensor Line Surge Arrestor, for 8 lines
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