MK Diamond Baldor Motor - Manual (Page 21)

Installation & Operation 2-11 MN428
Repair of Motors used in Hazardous Locations
Repair of hazardous certified motors requires additional information, skill, and care. It is the customer’s
responsibility to select service shops with proper qualifications to repair hazardous location motors. Contact
the manufacture for additional repair details. Use only original manufacturer’s parts.
Repair of Explosion Proof or Flame Proof Motors Class I Division 1 and Zone 1
In the North American market, recertification programs are offered by Underwriters Laboratories and Canadian
Standards Association which allow authorized service shops to mark the rebuilt motors as certified. In the
international markets using IEC based requirements, repair should be undertaken only after consulting
IEC60079−19 Explosive Atmospheres−Part 19 Equipment repair, overhaul and reclamation. If use of a certified
repair facility is desired, consult the IECEX Repair Scheme at http://www.iecex.com/service_facilities.htm
Explosion proof and flameproof motors achieve their safety based on the mechanical construction −
flameproof joints and bearing clearance, and the electrical design including any thermal limiting devices. If it is
necessary to repair a flameproof or explosion proof motor, it is critical that the mechanical flameproof joints be
maintained. Consult Baldor Electric Company for flameproof joint construction details.
Use only Baldor•Reliance supplied parts. Baldor does not recommend reclamation of parts.
Since this protection method also relies on temperature being maintained, make sure that any rewinding uses
the original electrical designs, including any thermal protection that may be present.
Repair of Dust Ignition Proof Motors − Class II Division 1 and 2, Zone 21 and 22.
For Dust Ignition Proof, proper sealing is required. Do not modify the motor construction to add any additional
opening, and ensure that proper sealing is maintained in the connection box and at the shaft seal. Since this
protection method also relies on temperature being maintained, make sure that any rewinding uses the original
electrical designs, including any thermal protection that may be present
Repair of Class I Division 2 and Zone 2 motors
For Division 2 and Zone 2, the internal and external temperatures are of concern. Since this protection method
also relies on temperature being maintained, make sure that any rewinding uses the original electrical designs,
including any thermal protection that may be present. Use only Baldor replacement thermostats, if provided.