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Filing bussing

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Watt-Me worry?

Member
Location
South, Fl
Here's the link I found: mikeholt.com/.../Evaluating-Water-damaged-Electrical-Equipment.pdf
It has a NEMA chart of recommendations. I did Insurance work for many years - maybe you should hire an outside adjuster?
 
petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
was it filed, or did someone take emery paper to it and remove the tiny layer of corrosion that was there?

i don't know how you can tell the difference.
 
Energize

Energize

Senior Member
Location
Milky Way Galaxy
Tell your insurance company to look at NEC 110.12(C).

All underlining is mine for emphasis.

Internal parts of electrical equipment, including busbars, wiring terminals, insulators, and other surfaces, shall not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or corrosive residues. There shall be no damaged parts that may adversely affect safe operation or mechanical strength of the equipment such as parts that are broken;bent;cut; or deteriorated by corrosion, chemical action, or overheating.
 
petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
Energize said:
Tell your insurance company to look at NEC 110.12(C).

All underlining is mine for emphasis.

Internal parts of electrical equipment, including busbars, wiring terminals, insulators, and other surfaces, shall not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or corrosive residues. There shall be no damaged parts that may adversely affect safe operation or mechanical strength of the equipment such as parts that are broken;bent;cut; or deteriorated by corrosion, chemical action, or overheating.
Click to expand...

I have bolded the key phrases. I don't see how this paragraph prevents judicious repair of equipment. Filing away the plating on a busbar would not appear to be appropriate. OTOH, simple cleaning in a proper manner would not appear to be an issue.
 
Energize

Energize

Senior Member
Location
Milky Way Galaxy
petersonra said:
I have bolded the key phrases. I don't see how this paragraph prevents judicious repair of equipment. Filing away the plating on a busbar would not appear to be appropriate. OTOH, simple cleaning in a proper manner would not appear to be an issue.
Click to expand...

As you stated, cleaning is one thing, filing is another. The OP stated the busbar was "repaired" by filing. IMO, that is unacceptable.
 
brian john

brian john

Senior Member
Location
Leesburg, VA
Perfect example where burnishing is practical.

Saturday night we did an EPM and testing 36 Allis Chamlers LAF draw out CBs. Several of the CBs had excessively high contact resistance readings.

Similar CBs had readings in the 30-60 micro-ohms a few had power poles with readings at full scale of the Micro-ohm meter/ Ductor/ Digital Low Resistance Ohm Meter (DLRO). Two options replace the CBs, expensive at about 12,500 each, and it was Saturday Night Sunday Morning. or burnish/dress the contacts.

We burnish the contacts the reading drop to an acceptable range, CB is cleaned, tested and re-installed. At some point we will IR these CB's though the contacts are not accessible for this service BUT I have no fear theses CB will continue to operate and perform adequately with this minor repair.
 
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