Larson Electronics EPSW-20A Instructions Manual

Larson Electronics EPSW-20A Instructions Manual Manual pdf 1 page image

EPSW-20ASAVE THESE INSTRUCTIONS FOR FUTURE REFERENCEThis device complies with requirements of Underwriters Laboratories, Inc. for use in hazardouslocations, as listed on the device when used with suitable enclosures.WARNING: To avoid risk of explosion, all flat machined surfaces must be kept clean and free fromscratches, dents, debris, paint, and corrosion. The flat machined surfaces are explosion proof joints, andmust be clean and undamaged on both the enclosure and cover.INSTALLATION1. The surfaces of the flat ground joint are precision machined to insure an explosion proof jointand must be protected from scratches or damage during installation.2. When switch is mounted in the enclosure, it must be mounted to agree with cover indication ofoperation. That is, when the cover indicates ON, the switch must be in the ON condition.3. Before the cover is installed, the flat ground joint surface must be thoroughly wiped clean of anydirt, grit, or other foreign substances and a light thin coating of lubricant placed on the joint toprevent possible corrosion.The joint between the box and the cover has been made accurately to .0015” to prevent thepassage of this accuracy is destroyed.4. ALL cover screws must be installed with at least five full threads engaged and must be securelytightened. All cover openings must be closed with a suitable cover.5. Gaskets must not be added to these devices. Only gaskets designed for and permanentlyinstalled in these devices may be used.6. In accordance with the hazardous location information specifying Class and Group listingmarked on the device, sealing fittings must be added that will comply with requirements in thelatest issue of the Canadian Electrical Code or National Electrical Code and any specialrequirements that are stated in the instruction sheet with the enclosure.MAINTENANCEBefore removing the cover from any such device for inspection or maintenance, the power supply circuitmust be OFF.WARNING: To prevent risk of explosion, hammers and prying tools must not be used to remove coversoff enclosures. Damage to the explosion proof flat machined surfaces on cover and enclosure mayresult. Handle covers carefully. Do not place them on surfaces that might damage or scratch the flatmachined surfaces.Before replacing the cover, after it has once been removed, the flat ground joint surfaces must becleaned as described in step 3 under installation.WARNING: To prevent risk of explosion, replace devices if the flat machined surface is damaged,scratched, dented, or corroded. Field rework of flat machined surfaces is not possible.

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