ᐅ For self-purchased products intended for installation, should the original packaging remain unopened?

Hi, I have booked an appointment with an electrician to install outdoor lights.

I ordered the outdoor lights (brand: slv) myself online. I unpacked all of them and checked for damages to avoid any unpleasant surprises later.

However, I have now heard from someone that I shouldn’t have unpacked the lamps. If we provide the products ourselves for the installation, they apparently need to be in their original packaging, unopened?

A few years ago, I had a cooktop installed that I had already unpacked and placed into the countertop. So what is correct now? Can the electrician refuse to install the products?

Who places the order is not only allowed but also required to unpack. The electrician is released from any warranty if you order the product of your choice.

Elli will never provide a guarantee for third-party products.

What kind of nonsense is that?
The kitchen fitter of my parents tried to explain the same to me.
We then told him that we would also be happy to buy the kitchen elsewhere.

The electrician has to provide a warranty for the installation but not for the materials if they are not supplied by him.

Thank you all for your quick responses!!!