David,

I don't know what your background is but it doesn't appear to be associated with electricity as it pertains to a home. Unfortunately, electricity is the most difficult area for a new home inspector as defects are not as discernible as with other components. If you would like to expand your electrical knowledge I suggest purchasing & studying Audel's Practical Electricity, if you get through that book you will understand everything you will ever encounter electrically within a home inspection.

In regards to SoP... Don't exceed the standard unless there is a reason to do so and you are an expert in the field area you are reporting on. Develop your inspection technique around the SoP and trust that it sufficient to accurately report the condition of the building. Many hundreds of years of experience by top minds have honed the inspection standards into what we have today, deviation is usually not necessary or recommended.

Good luck in your endeavor - Joe.