APPS: Basic difference between Zone-2 and Zone-1 equipment

[The AList]

==> Automation List post by Paul Spresser...
To view or reply to this thread: http://www.control.com/thread/1026237047#1246493084


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Re: APPS: Basic difference between Zone-2 and Zone-1 equipment
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The Flameproof (Ex d) technique allows the use of any commercial electrical or electronic equipment inside of the Ex d enclosure. If the atmosphere becomes explosive and seeps into the enclosure, a spark will only ingnite the mixture inside the Ex d enclosure because the combination of the long joint length (flame path) and the small gap (
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