An example of negligence is the system installed this year ago:
The ladder is made of metal and the supply cable has about 400 V DC.

You can see from the cable that the roof tile has rubbed it and the risk is that the cable wire will be exposed, presenting a risk of electric shock.

Here’s how to make it safe:

The cable was fed through a UV and fire resistant flexible conduit.

The pipes were attached to the ladder so that the cable was properly shielded for the future.