Why didn’t I get a Christmas card this year?

I remember several years ago discussing by phone some of the deficiencies I was viewing in the field with Rusty Anderson, a recently retired...

Testing Agencies & the Electrical Inspector

by Laura L. Hildreth and Chuck Mello The relationship between the electrical inspector and recognized testing laboratories and field evaluation bodies (FEBs), as recognized by...

Electrical Questions from the Field

My accomplices and I have made up a mock service diagram to be used in an educational program.  The electrical service is rated 4000 amps at 120/208 volts. We are supplying the service equipment with 12 sets of 600 kcmil aluminum type THWN per phase.

PV MODULES, Part 1 — What the AHJ Needs to Know,...

The Physics of the PV module. (Seasoned electrical authorities having jurisdiction (AHJs) may skip the section.) Photons (solar energy from sunlight) hit a PV module and...

Large-Scale PV Inspection Teams Planning for Success

Many years ago, I accepted a position working on a joint venture called KFM (Kiewit/FCI/Manson) to assist with the construction of a new bridge...

Ensuring the Safety of the Public: The Process of Inspecting PV...

The complexity of photovoltaic (PV) power systems dictates a careful and thorough inspection, starting with a detailed permit application and a plan review of...

Enforcer Reinforcement

Throughout my career, I have traveled the world to participate in many different standards systems and dialogues related to safety. A common question I’ve...

Wiring Requirements in Hazardous Locations

One common way of minimizing possibilities of electrical wiring and equipment becoming an ignition source in hazardous (classified) locations is to locate the equipment...

Adventures in Inspecting Large Scale PV

If you were inspecting PV systems before publication of the 2008 NEC, you may have seen some interesting DC combiners (see photos 2 through...

Selective Coordination – What the Inspector Needs to Know

Selective coordination has been a requirement in the NEC since 1993 when it was first required for circuits with multiple elevators. Since then, additional...