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IAEI Magazine | Author: J. Philip Simmons
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J. Philip Simmons

J. Philip Simmons has written and illustrated several authoritative books on electrical systems. He is acting chair of NEC CMP-5, chairman of IAEI Neon Installation Manual, and a member of the Inspector Certification Exam Committee. He is a former employee of NFPA Standards Council and NEC Technical Correlating Committee, past chair of NFPA Electrical Section, former member of NEC CMP-1 and 17, and past chairman of CMP-19.


Air Conditioning & Heat Pump Equipment

Reviewing and understanding the information on equipment nameplates is important in properly evaluating an air-conditioner or heat pump installation. It also simplifies the selection of the correct branch-circuit wire, overcurrent protection and disconnect sizes. Most all the information needed by the installer can be found by reference to the units data name-plate. The following is an example of the type of information found on the nameplate for a residential central air-conditioning unit.

Service & Main Bonding Jumpers

The main bonding jumper is one of the most critical elements in the safety grounding system. This conductor is the link between the grounded service conductor, the equipment grounding conductor and in some cases, the grounding electrode conductor. The primary purpose of the main bonding jumper is to carry the ground-fault current from the service enclosure as well as from the equipment grounding system that is returning to the source. In addition, where the grounding electrode conductor is connected directly to the grounded service conductor bus, the main bonding jumper ensures that the equipment grounding bus is at the same potential as the earth.

Services for Multi-Occupancy Buildings

We published a photograph in the "Code Violations” section of the March/April 1995 IAEI News which shows 21 service disconnecting means that are grouped in the same location on the end of an apartment building. Four service laterals supply the building from a common transformer. The caption with the photograph indicates that the installation is in violation of Section 230-71(a) of the National Electrical Code® as there are more than six disconnects grouped at the same location.