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What do the Explosion Groups B, C, D signify?

April 26, 2017explosion groups

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What do the Explosion Groups B, C, D signify?

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The groups signify that the fixture is rated for use when the explosive gases in these groups are present. See NFPA(National Fire Protection Association)/NFC (National Fire Code) for further information. Consult the local authority having jurisdiction for proper compliance to codes in your area.