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New UL Listing Service for Surge Protectors and Isolators for Use on Cathodically Protected Systems for Use in Hazardous Locations

Surge Protection Mark

UL announces a new HazLoc product category and associated Listing service for Surge Protectors and Isolators for Use on Cathodically Protected Systems for Use in Hazardous (Classified) Locations, VZQO.

This category covers surge protectors and isolators used to provide AC grounding and DC blocking for cathodic protection of underground pipelines and similar installations in hazardous locations. They may also be used to minimize galvanic corrosion between structures of dissimilar metals.

These devices have been investigated for providing effective grounding path characteristics as noted in the 1999 National Electrical Code, Section 250-2 (d). Additionally, these devices have been investigated for providing isolation of objectionable direct current ground currents as noted in the 1999 National Electrical Code Section 250-6 (e). Manufacturers of these devices provide installation instructions and maintenance information to assure proper installation and continuous protection of the equipment.

The basic standards used to investigate products in this category are UL 1203, "Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations" and UL 1604, "Electrical Equipment for Use in Class I and Class II, Division 2, and Class III Hazardous (Classified) Locations", as appropriate.

Look for the UL Listing Mark on Products

The Listing Mark of Underwriters Laboratories Inc. on the product is the only method provided by UL to identify products manufactured under its Listing and Follow-Up Service. The Listing Mark for these products includes the UL symbol (as illustrated above) together with the word "LISTED", a control number, and one of the following product names, as appropriate: as appropriate -- "Surge Protector for Use in Hazardous Locations", "Overvoltage Protector for Use in Hazardous Locations", "Polarization Cell Replacement Unit for Use in Hazardous Locations", or other appropriate product name as shown in the individual Listing.

UL certifications have already been issued under this product category.

For additional information regarding this or other HazLoc services, please contact hazloc@ul.com.

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