Air terminal

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domnic

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Electrical Contractor
What is the glass ball on air terminals for lighten for ????????????????????????????????????????????????????????????????????????????????????
 
I don't know if it's true, but an old-timer told me once that the glass balls were a strike indicator...they would shatter when the terminal would take a lightning hit.
 
They are collectors items now, sort of like the old colored insulators on early telephone or power poles.

grich is correct. They were supposed to shatter and fall off as proof of a lightning strike.
 
grich said:
I don't know if it's true, but an old-timer told me once that the glass balls were a strike indicator...they would shatter when the terminal would take a lightning hit.
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How does the lighting break the glass. heat or HZ ?
 
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