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Old 02-20-2012, 12:40 PM   #1
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Spacing Requirements for Circuit Breakers


What does it mean when they mention "Thru Air and Over Surface" for minimum spacing requirements for circuit breakers?

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Old 02-20-2012, 05:48 PM   #2
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Spacing Requirements for Circuit Breakers


Where and who mentions this?

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Old 02-20-2012, 06:32 PM   #3
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Spacing Requirements for Circuit Breakers


Through air: between two conductive parts in the air of the shortest distance.
Over surface: between two conductive parts measured along the surface of insulating material the shortest distance
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Old 02-20-2012, 06:43 PM   #4
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Spacing Requirements for Circuit Breakers


Basically, this is the responsibility of the manufacturer of products, such as service panels or any other equipment. Basically, this refers to the minimum spacing between uninsulated live parts of opposite polarity; and between an uninsulated live part and a grounded part and mounting surface.
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Old 02-20-2012, 07:46 PM   #5
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Spacing Requirements for Circuit Breakers


BRRIC, the nccer level 2 electrical text book in chapter 10 talks about established voltage ratings are based on clearances or space both through air and over surfaces between components of the electrical system, and I am having a hard time wrapping my mind around what they are talking about.

Hawkeye11, Thank you for the synopsis.
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