Using the correct types of cable
As electricians, we need to properly design a circuit and use materials that are suitable for it's location. Regulations change which means a few years ago the circuit may have been designed differently. A common difference is the use of grey PVC cable for outside wall lights i.e. decorative lights or flood lights. You'll often see a small amount of grey cable coming straight out of the wall and in to the back of a light.
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