White stuff on a splice

Tainted

Senior Member
Location
New York
Occupation
Engineer (PE)
There is white stuff on a splice in a service end box. What is this? These are service conductors.

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It looks like aluminum oxidation which could be from using a connector not listed for aluminum conductors. If both conductors are copper than it's something else.
 
It looks like aluminum oxidation which could be from using a connector not listed for aluminum conductors. If both conductors are copper than it's something else.
I see. Only one splice is like this, the rest seem fine
 
It looks like aluminum oxidation which could be from using a connector not listed for aluminum conductors. If both conductors are copper than it's something else.
Or moisture wicking down the aluminum conductor under the insulation, getting into the connector and then overflowing out of it, then evaporating, leaving the oxidized aluminum behind.

So the question would be, how is that moisture getting into the conductor in the first place? Where is that conductor coming from?
 
Or moisture wicking down the aluminum conductor under the insulation, getting into the connector and then overflowing out of it, then evaporating, leaving the oxidized aluminum behind.

So the question would be, how is that moisture getting into the conductor in the first place? Where is that conductor coming from?
Maybe the water is coming from the street and using the wire insulation as a pipe and goes inside the gaps of the copper strands?
 
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