Log In Sign Up

NOTE: This is an unformatted excerpt from our online fire protection training library.

Identifying Materials & Equipment

Combustible Dusts

Conductive and Nonconductive

Combustible dusts may be considered conductive or nonconductive. In the past, conductive dusts have been defined by various values of resistivity Conductive dusts have been defined as those having a resistivity of 102 ohm-centimeter or less although this definition is no longer used.. Now metal dusts and dusts with similar characteristics are considered to be conductive dustsConductivity itself is a concern because the dust may conduct current through a layer and ignite it due to the current, or if it were to enter enclosures it might cause the breakdown of electrical insulation between live parts. Metal dusts require special consideration for two other reasons: the typical particle sizes Dust penetration tests are one of the tests performed on equipment intended for Class II areas. The test particles are much smaller for Group E (conductive) dusts than for Group F or G. are very small and the particles are abrasive The very small particles of metal dusts are more likely to enter bearing enclosures than larger dust particles. The bearings could be on motors or on mechanical equipment, and the excessive heat and wear on the bearings could in turn ignite accumulated dust on the bearings. Generally nonmetal dusts are both larger and less abrasive..
NOTE: This is an unformatted excerpt from our online fire protection training library.

Contact Us:

Please fill in the fields below:

    Privacy Policy
    Please choose all that interest you.

    Contact Customer Service at AcademySupport@jensenhughes.com or 800-930-9414 option 1.

    Our regular support hours are 9:00 AM to 5:00 PM, Monday through Friday, except holidays...