Shingles is the reactivation of a viral infection in the nerves to the skin that causes pain, burning, or a tingling sensation, along with an itch and blisters in the skin supplied by the affected nerve. It is caused by the varicella zoster virus[1] , or VZVâthe same virus that causes chickenpox.
Types of electrical circuits. There are three main types of circuits encountered in a domestic situation. They are ring circuits, radial circuits and lighting circuits.
Chasing âGhost Tripsâ in GFCI-Protected Circuits. By Jack Smith. This issue of âSolid Groundâ talks about ground fault circuit interrupters (GFCIs), why they are necessary, and how to troubleshoot GFCI-protected circuits. A GFCI is one of the most common residential, commercial, and industrial safety devices. The most common types are single-phase electrical outlets used in households near water sources, such as in kitchens, bathrooms, and outdoor receptacles.