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Significant Proposals for 2005 NEC Part XV

As Reviewed by Mike Holt

The following text is a quick summary of the proposed changes for the 2005 NEC. This document is a work in progress and many will be changed by the Code panel over the next few months. Some of these you might find important to your work and you might want to follow their progress with me. Therefore, each week I will email you a few of these changes.

Each proposed change has a Report on Proposal (ROP) number, like 1-25. This number reflects the Proposal Number and all action on this proposal can be viewed in the following PDF document NECPart 4.

As always, I am looking to improve our products, so if you feel you have anything to contribute, please let me know at Mike@MikeHolt.com.


Article 682 Natural and Artificially Made Bodies of Water

17-154
Article 682 Natural and Artificially Made Bodies of Water
This new article covers the electrical installations of electrical wiring for in and adjacent to natural or artificially made bodies of water not covered by Article 680. This includes aeration ponds, fish farm ponds, storm retention basins, sewage treatment ponds, as well as irrigation channels.


Article 695 Fire Pumps

13-85
695.4 Continuity of Power.
(B) Supervised Connection.
(1) Overcurrent Device Selection. A sentence was added to clarify that the "carry the locked rotor current indefinitely" requirement only applies when sizing overcurrent protective devices, not the circuit conductors to the fire pump motor.

13-88
695.5 Transformers.
(B) Overcurrent Protection. A sentence was added to clarify the "carry the locked rotor current indefinitely" requirement only applies to sizing overcurrent protective devices, not the circuit conductors to the fire pump motor.

13-89
695.5 Transformers.
(C) Feeder Source.
(2) Overcurrent Protection. A sentence was added to clarify the "carry the locked rotor current indefinitely" requirement only applies to sizing overcurrent protective devices, not the circuit conductors to the fire pump motor.

13-100
695.6 Power Wiring.
(C) Conductor Size.
(2) Fire Pump Motors Only. New sentence alerts the Code user that conductor sizing for a fire pump motor shall be in accordance with the requirements for motors, specifically 430.22.

Author's Comment: Revised text reemphasizes that fire pump motor conductor sizing is based on 125% of the motor full-load current, not the overcurrent protective device rating.

13-104
695.6 Power Wiring.
(E) Pump Wiring. New text clarifies when Type MC cable is a suitable wiring method to protect conductors from the controller to the pump motor.

13-105
695.6 Power Wiring.
(H). Ground Fault Protection of Equipment. New subsection prohibits ground fault protection of equipment to be placed on the fire pumps circuit.

Author's Comment: This is already covered in 215.10 Exception No. 2, 230.95 Exception No. 2, and 240.13. But one can never be too careful especially with fire pump systems.

13-107
695.14 Control Wiring.
(E) Electric Fire Pump Control Wiring Methods. New text clarifies when Type MC cable is a suitable wiring method to protect fire pump control wiring.


Chapter 7 Special Conditions

Article 700 Emergency Systems


13-109
700.5 Capacity.
(B) Selective Load Pickup, Load Shedding, and Peak Load Shaving. Text revised to clarify when a single generator is permitted to supply emergency, legally required, and optional standby system loads.

Author's Comment: Load shedding is not required if the emergency source has capacity for the entire connected load.

13-110
700.6 Transfer Equipment.
(A) General. Transfer equipment, including automatic transfer switches, must be "listed" for emergency use.

Author's Comment: By substituting the term "listed" for "identified," transfer equipment is now subject to periodic follow-up inspection at the factory to ensure suitability for emergency purposes.


III. Sources of Power

13-135
700.28 Coordination.
Require overcurrent protective devices of an emergency systems be selectively coordinated.

Author's Comment: With proper selectively coordinated overcurrent protective devices, a fault in the emergency system will be localized to the overcurrent protective device nearest the fault, this allows the remainder of the emergency system to function.


Article 701 Legally Required Standby Systems

13-137
701.6 Capacity and Rating.
Text revised to clarify when a single generator is permitted to supply emergency, legally required, and optional standby system loads.

13-138
701.7 Transfer Equipment.
(A) General. Transfer equipment, including automatic transfer switches, must be "listed" for standby use.

13-145
701.19 Coordination
Require overcurrent protective devices of a legally required systems be selectively coordinated.

Article 702 Optional Standby Systems

13-148
702.6 Transfer Equipment.
A new exception clarifies when transfer equipment is not required for standby systems in industrial installation.

13-152
702.11 Outdoor Generator Sets.
This new section clarifies when a generator equipped with a readily accessible disconnecting means within sight of the building to serve as the require building disconnect.

Author's Comment: This requirement parallels similar requirements for emergency [700.12(B)(6)] and legally standby systems [701.11(B)(5)] already in the Code.


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