insulator

Well, you need a better insulator than just air.

The buswork running along the substation is protected from short-circuit by large insulators to avoid arcs to ground.

It's actually pretty hard to overcook the burger at this point because the onions act as an insulator, prevent us from overcooking the burger patty itself.

It's actually pretty hard to overcook the burger at this point because the onions act as an insulator, prevent us from overcooking the burger patty itself.