Tuck San s Reefer Workshop Featuring
I cannot recall the particulars of this case as it occurred over 1 year ago already. Definitely salt water entering gang box either through bad or missing gasket or a warped frame. Break it down The circuit breaker lugs were all frozen
So the wires had to be cut
Remove retaining ring from its groove with a flat screwdriver
Spring compression retaining ring for interlock release
Pull down on on/off plunger to remove spring, interlock mechanism and plunger
Remove the 4 screws securing breaker handle actuator unit, top plate and breaker to frame. Lift off breaker with actuator unit and ground pin.
Observe alignment with circuit breaker handle as it is removed. Be careful not to disturb cam positioning inside actuator. The plastic housing can separate.
Remove brass receptacle housing
And remove receptacle from brass housing
Stainless steel and brass clean up nicely. The brass is a little more work but is necessary for the new receptacle to slide into the bore. Wire brush and medium grain crocus cloth work well. Some brass housings have a groove at base end for a retaining ring which needs to be scraped and brushed clean. Once brass housings are polished clean a thick coating of LPS 3 left to dry overnight will keep the creeping corrosion at bay.
Reassemble The top 1/3 at flange end of the brass housing internal bore needs to be super clean for an easy fitting of new receptacle so only apply a light coat of LPS 3 if any here. Below the receptacle resting ledge a thick layer will be good. Dow Corning 111 valve lubricant and sealant works well on internal bore as well as Molykote 55 o-ring grease around receptacle o-ring. This will extend the life of your module and reduce your maintenance load.
To prepare the receptacle wires for a quick and smooth installation into the circuit breaker lugs they must be shaped for a compressible helical spiral. The wires are thick stranded gauge so a 3/8 closed end wrench can be slipped over for bending leverage.
Do not try to cut the wires to length because the circuit breaker lugs are not in direct alignment with receptacle.
Install receptacle into brass housing aligning tab at base of receptacle with notch in brass housing flange. This prevents rotation of receptacle within housing. After shaping the wires, the ends will need to be trimmed flat or the contact surface between wire and lug will be reduced. Poor contact area will result in overheating and reduced life of circuit breaker and receptacle.
Reassemble circuit breaker actuator to circuit breaker.
With circuit breaker switch in off position align circuit breaker switch handle with actuator mechanism. Install circuit breaker and secure to frame with the 4 screws. Lightly lubricate receptacle mating gasket with 111 and place over housing flange. While guiding actuator ground plunger into bore of receptacle ground pin insert wires into circuit breaker lugs being careful not to bend any wire strands. Tighten lugs. Bend the B phase wire to the side to allow free movement of ground pin plunger. Tighten the 4 receptacle housing screws evenly until gasket touches frame plus ¼ turn or so being careful not to squeeze out the gasket.
With circuit breaker and receptacle secured, bench test for smooth operation.
To reassemble on/off plunger first place interlock release mechanism in position on its actuator.
The sliding cam actuated block mounted on circuit breaker is aligned with plunger in interlock release mechanism. With o-ring and shaft greased, insert on/off plunger through faceplate and interlock release. The cam actuated release plunger will interact with deep groove in on/off plunger shaft.
Place spring into position into guides above interlock release
Push on/off plunger up through interlock release, spring and guides until groove for retaining ring is visible above interlock release mechanism.
And insert ring between release mechanism and spring
The module is now complete and is ready for testing in same manner as shown in 480V version with ohm and meggar meter test equipment before installation for use.