Was just goin to get plain box but this had wires fitted
I haven’t bought a prewired “gland” BUT if you think about this:
The positive(+) out of the panels is black wires typically (because carbon black thwarts UV best) as is the negative(-). So in any case a “standard” extension cable that is MC4 on both ends between the panel(s) and the SCC will “by nature” be opposite color than the pos(+) MC4 and neg(-) MC4 fittings if you are depending on color to plug stuff in: eventually somethings going to be visually reversed.
Polarity is determined by the connector/fitting- they won’t/can’t be plugged in reversed or aka installed backwards by
function- the colors are a convenience or ‘safety’ convention but the conductivity will function fine. You can take black and red electrical tape and ‘mark’ the ends like one might do with a 120VAC “traveller” for a three-way/two-way switch, or “round trip” for a wall switch to ceiling fixtures. You simply tape the wire with the right color tape.
(I typically use a colored permanent marker on the white AND put tape over that though it’s not required).
I said all the prior to give explanatory context to this:
Alternatively, I have to ask - in your situation with the gland having MC4’s on both ends- does your SCC take MC4 or wire inputs? Because if you have to cut an end for inserting into the SCC, then just reverse the cables in the gland at that time.
One of things that confuses people is that the ‘apparent’ male-female polarity convention expectations are wonky. The male-looking MC4 is
mechanically male but
electrically female. The reason is that the female-looking plastic connector has an ‘exposed’ (though internal) male conductor, and the male-looking plastic connector has the shrouded/protected
female conductor. This isn’t a problem because A) one should never disconnect any MC4 while a circuit can provide current due to arcing damage, and B) a switched two-wire disconnect (a DC Breaker is commonly used) should always be present for the disconnect. So the circuit can be open before unplugging them.
I hope this was helpful.
