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Providing exit terminals around the perimeter of the hull is the key to an effective system design since it enables the lightning down conductors to be routed externally to all wiring and conducting fittings. The illustration on the left shows a layout with six Siedarc electrodes and two HStrips providing exit terminals from an external network of conductors. The port view is the same. That is, there are six electrodes, and two HStrips. This layout embodies the ExoTerminalTM lightning protection system.
While the recommended number of electrodes for the typical boat is 6, as shown above, a smaller number may be adequate in salt water. For general information on placement of lightning conductors and grounding terminals, see the Grounding Guide. For a more technical discussion of the physical concepts see Grounding Concepts.
The flush-head fittings require a beveled hole as shown below. For a new build or sandwich hull requiring an epoxy plug, we can supply a metal template (FlushPlug) for forming the correct hole shape.
NOTE: We are changing our line of electrodes from tinned copper to silicon bronze and are still developing the information web page and pricing. These will be available in Marelon through-hulls, but not stainless, and have similar connection capabablities to those described below.SiedarcTM electrodes are available with four types of connection as summarized below.
The daisy chain connection is intended to be used whenever a cable run passes by a SiedarcTM electrode with an ultimate termination on an immersed terminal such as a HStripTM, or keelbolt. In The EHLoopTM, as shown in the diagram above, both the daisy-chain SiedarcTM electrode and an HStripTM are connected into a continuous loop that also includes the mast base and chainplates.
The EConTM connection comprises a heavy-duty lug that has been rounded off and tinned to minimize sideflash risk from the connection. All connecting surfaces far exceed the cross sectional area of the cable.
In both parallel and perpendicular connections the cable is rotary swaged onto the fitting using the same technique as is used for standing rigging to give a near-perfect connection. The parallel connection uses a separate connecting fitting, the BallConTM, that is secured to the electrode with a hex screw. This allows for a low-clearance (<3" from outer hull surface) installation when the cable has to run up the hull. The ball-shaped BallConTM connection also provides a large thermal capacity for heat dissipation. The perpendicular connection is swaged directly onto the electrode before it is embedded in the through hull and so requires more clearance. For an 8" radius of curvature, this is about 13", as shown below. If smaller radii of curvature are acceptable, the flexible heat shrink and cable allow for a clearance of about 6-7" from the through-hull head.
Please call or email if you have any questions.