[reeddavid]

The concept of installation was very simple – just put clips on wires.

However even with my entire electrical panel switched off at the main breaker, the supply from the meter is always live. So with the panel cover removed in order to install the clips, it would have been possible to touch the supply lines and get a lethal shock.

If you have any qualms about working safely in an electrical panel, hiring an electrician is the way to go.