Download IEEE Recommended Practice for Grounding of Industrial and by Elliot Rappaport, Chair Daleep C. Mohla, Vice Chair PDF

By Elliot Rappaport, Chair Daleep C. Mohla, Vice Chair

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Extra info for IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems

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System grounding connections downstream of the disconnecting device have the same rules as for servicesupplied circuits. Copyright © 2007 IEEE. All rights reserved. 37 IEEE Std 142-2007 CHAPTER 1 The point of grounding for systems shall be the neutral or common conductor where one exists; otherwise the point shall be a phase conductor. On systems over 1000 V, a transformer-derived neutral may also be used as the attachment point for a system ground. This method is not mentioned for effective grounding of low-voltage systems.

With three-wire systems, the generators would be considered a separately derived source, since there would be no continuous connection through a system neutral. 3. 44 Copyright © 2007 IEEE. All rights reserved. SYSTEM GROUNDING IEEE Std 142-2007 Figure 1-30—Ground fault on a system with two parallel generators Where four-wire systems are involved, it has been shown in IEEE Std 446™ (IEEE Orange Book™), Chapter 7, that objectionable currents can flow if a three-pole transfer switch is used. Whether or not the neutral is grounded at the generator as well as at the normal service, ground-fault relaying errors can occur.

Copyright © 2007 IEEE. All rights reserved. 73 times the voltage of a neutral grounded 240 V system. Since this voltage can appear across a single pole of a breaker, 277 V rated breakers may be required. 2) There must be positive identification of the conductor with the highest voltage to ground to avoid connecting 120 V loads to that conductor. 3) The fault currents on the single-phase system may be higher than normally expected for the size of the system, possibly requiring higher rated panelboards.

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