Mike Dolt Enterprises
Mike Dolt Enterprises
User: j9DuBois, Location: Bay Area
Asked on: Sunday, May 1, 2011 at 10:25 pm EDT
Answered on: Tuesday, May 14, 2024 at 4:51 am EDT
Question: Ok, I know this is Mike Holts forum, but I would like to know if there is a book of visual aids that would indicate what to look for in an inspection. For example a service entrance of a multifamily dwelling where each dwelling is 100 amps each and the meters are in a garage...what do you look for? what are the likely problems, what kinds of protection (ie, behind locked doors, bollards).or the tap rule, in real terms, very confusing to me.Thanks
Book of Visual Aids for Electrical Inspections
NFPA 70E: Standard for Electrical Safety in the Workplace NFPA 70: National Electrical Code Illustrated Guide to the National Electrical Code by Charles R. Miller Electrical Inspection and Troubleshooting Guide by John Whitfield Mike Holt's Illustrated Guide to Understanding the National Electrical Code by Mike HoltSpecific Inspection Areas
Service Entrance of a Multifamily Dwelling (100 Amps per Dwelling) Likely Problems
Oversized service conductors Inadequate overcurrent protection Open grounds or neutrals Improper grounding and bonding
Visual Aids
Ensure conductors are sized for the total load (100 amps x number of dwellings) Check main overcurrent devices for proper amperage rating Inspect ground rod and bonding connection for continuity Verify conductors are color-coded and terminate correctly
Tap Rule Definition
The tap rule allows a smaller conductor to be used for a portion of the circuit length, provided certain conditions are met.
Conditions
The load on the tap does not exceed the allowable ampacity of the smaller conductor. The length of the tap does not exceed 10 feet (3.05 m). The tap is protected by an overcurrent device rated for the ampacity of the smaller conductor.
Visual Aids: Verify the load on the tap is within the capacity of the smaller conductor. Measure the length of the tap to ensure it does not exceed 10 feet. Check the overcurrent device protecting the tap to ensure it is rated for the appropriate amperage. Flag for review