Boston Area Fire Alarm Insulators in Service (125)

By Joe Maurath, Jr.; posted March 31, 2020

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Old 4kv distribution above (the right side secondary deadend looks like a Hewlett disc) with two bright aqua signals on the fire alarm crossarm add a lot of pizazz to an otherwise ordinary looking pole. Note the wood blocks as spacers between the secondary arms. A standard through-bolt goes through a hole in the block's center. This is a method of double-arming that you do not see much more of these days.

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