In uk.d-i-y, Matthew Clement wrote:
I recently purchased a number of lights from Ikea which I'm trying to
wire up. My electrical system is loop-in, and I'm wondering whether
I've done the job correctly (it all seems to work), and more
importantly, safely. Here's what I've done:

Three red wires (live): connected to each other via a connector block
Two black wires (neutral): connected to N
Black/red wire (switched live): connected to L
Yellow/green wire (earth): connected to earth

I suspect the connector block doesn't meet electrical code, but is it
safe? I don't want to burn my house down!

If the list of wires had as its last line "Three yellow/green wires:
connected to earth", I'd have said "good enough"; a connector block
is acceptable if it fits nicely in the back box of the fitting, which
then acts as the required non-flammable enclosure. Are you sure there's
only one green-yellow wire? Maybe (this is quite common) it's got all
three earth wires, I mean Circuit Protective Conductors, twisted together
in one piece of green-and-yellow sleeving? If so, you're basically in
OK shape (he says, hoping, and opining sight unseen, any impression
that this posting is anything other than random line noise is in the
fevered imagination of the reader, disclaim, disclaim, etc. etc. ;-).
If you can secure the connector block (maybe with a small cable tie,
say) to prevent it flapping about and risking the screws touching any
other bit of metalwork, so much the better.

If, on the other hand, there's only a single strand of earth wire,
you're in unsafe territory, as there's then no way for two of the
three cables to carry the earth onwards. B-a-a-a-a-d news...

HTH, Stefek