Electrical Equipment in Interior Chemical Storage Spaces

Raceways All raceways and raceway devices and boxes in a CHEMICAL STORAGE SPACE should be non-metallic or otherwise rated for the atmosphere. * See Croft, Terrel and Summers, Wilford, American Electricians’ Handbook, Ed. 12, Sec. 9-340(b).See NEC Art. 110.11: Deteriorating Agents. * See NEC Art. 378.10: Non-Metallic Raceways. * See NFPA 70HB08, Art. 100, “Labeled”, Explanatory Note. * See SDS Calcium Hypochlorite, Section 10 Stability and Reactivity Data. * See SDS Sodium Hypochlorite, Section 10 Stability and Reactivity Data. * See SDS Hydrochloric Acid, Section 10 Stability and Reactivity Data. * See SDS Muriatic Acid, Section 10 Stability and Reactivity Data. Sealed Raceways should be sealed at the point of entry to the CHEMICAL STORAGE SPACE to prevent the egress of liquids, fumes, vapors, and gases from the CHEMICAL STORAGE SPACE via the conduit. Note: Explosion-proof seals are not required, unless required by the AHJ. * See Durston, Lee, Design, Construction, and Testing of the Commercial Air Barrier. * See NEC Art. 300.7: Raceways Exposed to Different Temperatures. Metal Raceways Metal raceways should be equipped with a grounding conductor sized according to NEC Article 250 to maintain device ground potential in the event of degradation of the raceway. * See ANSI/IEEE 241, Section 5.17.6. * See Croft, Terrel and Summers, Wilford, American Electricians’ Handbook, Ed. 12, Sec. 9-340(b). * See International Association of Electrical Inspectors, Soares Book on Grounding, 8th Ed., 2001, p157. * See NEC Article 250-110(2). Electronics All electrical equipment, devices and fixtures should be listed and labeled for the expected atmosphere of the space. * See NFPA 70HB08, Article 100: Labeled, Explanatory Note. * See NFPA 70HB08, Article 100: Listed, FPN. Light Switches Any light switches installed inside interior CHEMICAL STORAGE SPACES should be approved for use in wet and corrosive atmospheres, or shall be otherwise protected, as by a weather-proof actuator cover with a gasket. * See NEC Article 110.11: Deteriorating Agents. Permanent Electrical Devices All permanently connected electrical devices should be grounded per the NEC or other applicable code, using a separate grounding conductor which does not depend on the conductive integrity of any metal conduit exposed to chemical-STORAGE space air. * See ANSI/IEEE 241, Section 5.17.6. * See Croft, Terrel and Summers, Wilford, American Electricians’ Handbook, Ed. 12, Sec. 9-340(b). * See International Association of Electrical Inspectors, Soares Book on Grounding, 8th Ed., 2001, p157. * See NEC Article 250-110(2). 4.6.3.2.1 Wet and Corrosive * See NEC Article 100: Location, Wet. * See NEC Article 110.11: Deteriorating Agents. * See SDS Calcium Hypochlorite, Section 10 Stability and Reactivity Data. * See SDS Sodium Hypochlorite, Section 10 Stability and Reactivity Data. * See SDS Hydrochloric Acid, Section 10 Stability and Reactivity Data. * See SDS Muriatic Acid, Section 10 Stability and Reactivity Data. 4.6.3.2.2 Electrical Conduit * See NEC Article 110.11: Deteriorating Agents. * See NEC Article 300.7: Raceways Exposed to Different Temperatures. * See SDS Calcium Hypochlorite, Section 10 Stability and Reactivity Data. * See SDS Sodium Hypochlorite, Section 10 Stability and Reactivity Data. * See SDS Hydrochloric Acid, Section 10 Stability and Reactivity Data. * See SDS Muriatic Acid, Section 10 Stability and Reactivity Data.