[TowerTalk] Fiberglass Enclosure

Jim Brown jim at audiosystemsgroup.com
Sun Aug 12 17:00:00 EDT 2018

Hoffman-style enclosures are widely available in the electrical supply 
chain in a wide variety of sizes, styles, and materials.  They can be 
found online, and I found a particularly useful one at my local 
electrical supply store that I used to house eight lightning arrestors.  
The one I chose came with a steel backplate, to which I mounted the 
arrestors, and which I bonded to my ground system.

FWIW -- for most applications of these enclosures, shielding is not 
required, so the presence of steel is structural rather than electrical. 
AND -- for shielding to WORK, it must be continuous, AND all 
penetrations of the enclosure must be bonded to it at the point of 
penetration. The gap presented by an insulating weatherproof gasket 
defeats shielding because it interrupts the shielding and forms a slot 

73, Jim K9YC

On 8/12/2018 1:04 PM, kstover at ac0h.net wrote:
> These are epoxy powder coated steel not fiberglass.
> http://www.kf7p.com/KF7P/JunctionsBoxes.html

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