Why black cable with earth

Why black cable with earth

Why black cable with earth

Just changing a light, the old one didn’t need an earth. The new one does, it’s using a greyed sleeved blue for neutral and a brown for the live. I pulled the other 2 cables through and there is an earth cable and black cable put into a connector block. My question is, why is the black cable connected in with the earth and so I can I just connect the earth cable from the fitting into the earth/black cable block. Photo attached.

Many thanks for your help.

by Bobbya82

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