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