Burnt Polaris tap

[ggunn]

That wire you see is from the melting that happened. They weren't stripped that far back.

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The three causes for this I have seen/heard of are:

Undertorquing the connection
Overtorquing the connection
Using copper only lugs to connect aluminum conductors

 

[ptonsparky]

The three causes for this I have seen/heard of are:

Undertorquing the connection
Overtorquing the connection
Using copper only lugs to connect aluminum conductors

Cu only lugs are rare nowadays.

 

[ggunn]

Cu only lugs are rare nowadays.

But they are out there. I know of a case that happened a couple of years ago where nine SolarEdge Synergy Units were burnt up because the installer used copper only lugs to connect aluminum AC conductors to them.

 

[electrofelon]

Cu only lugs are rare nowadays.

they may be rare for mechanical, but fairly common for compression I believe.

 

[Electrical Geek]

I saw this happen when the wrong size wire was installed.

 

[pv_n00b]

I don't think I have seen a terminal fail unless it was installed incorrectly or in an environment it was not designed for. These are really good terminals if used correctly.

 

[ptonsparky]

I don't think I have seen a terminal fail unless it was installed incorrectly or in an environment it was not designed for. These are really good terminals if used correctly.

That's pretty much the point. Installer error.

 

[jaggedben]

I go with one of the following:
- installed upside down and collected water
- lesser brand got too hot. I've seen Greaves melt through under normal conditions and I won't buy that brand again. Insulated housing melted through.

Figuring either of these happened in close enough proximity to ground or another conductor.

 

[electro7]

Can anybody help me understand what these Wagos are rated for?

I'm assuming in the US we go by the UL listing. Are the other listings for other countries?
But what would PV wiring be, the "building" wire that it lists?

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[rambojoe]

Can anybody help me understand what these Wagos are rated for?

I'm assuming in the US we go by the UL listing. Are the other listings for other countries?
But what would PV wiring be, the "building" wire that it lists?

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The rating is listed in your hand... what do you not decipher?

 

[electro7]

The rating is listed in your hand... what do you not decipher?

I wanted to confirm that solar branch circuits are considered "building wire"? (I assume they are)

Are they rated for DC voltage?
I've seen these burnt up in a DC system before, but I'm not sure what the cause was from.

In my above post- are the other designations to the left listing agencies in other countries and not something we go by in the US?

What does "JET" mean on the label?

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[synchro]

What does "JET" mean on the label?

https://www.jet.or.jp/en/law/pse/index.html

 

[electro7]

https://www.jet.or.jp/en/law/pse/index.html

Thanks! Japan

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