At Generation 3 Electric, our highly skilled electricians perform a variety of electrical inspections every day. Knob and Tube Investigations are labor intensive inspections that we perform in many beautiful and charming old homes in and around Philadelphia. These are in high demand now because many insurance companies are denying homeowners coverage due to the prescence of this deteriorating, dangerous and obsolete wiring.
Even if we visit a home for a lighting project, our technician will inspect the electrical system for safety. Recently, one of our master electricians was performing an evaluation of the grounding system during an inspection and found some issues.
The photos below show his method of testing the grounding system and his comments follow.