Download IEEE Std 142-1982, IEEE Recommended Practice for Grounding by Institute of Electrical & Electronics Engineers PDF

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1977, pp. 92–99. Gustafson, R. , and Albertson, V. D. “Neutral-to-Earth Voltage and Ground Current Effects in Livestock Facilities,” IEEE Transactions, vol. PAS-10, no. 7, July 1982, p. 2090. Kaufmann, R. H. and Page, J. C. “Arcing Fault Protection for Low-Voltage Power Distribution Systems,” AIEE Transactions on Power Apparatus and Systems, vol. 79, June 1960, pp. 160–167. Surbrook, T. , Reese, N. D. and Althouse, J. , “Parameters Affecting Neutral-to-Earth Voltage Along Primary Distribution Circuits,” IEEE Transactions on Industry Applications, vol.

1 Grounded/Grounding Conductor Arrangement. Since the UPS module output neutral is solidly connected to the bypass input (service entrance) neutral, the UPS module is not considered a separately derived system according to the NEC. In this system, (1) the UPS neutral should not be bonded to the equipment grounding conductor, and (2) no local grounding electrode conductor should be installed to the UPS module. 2 Features/Performance. While this arrangement may be typical for 208 V input/208 V output UPS systems, it does not provide any isolation or common mode noise attenuation for sensitive loads.

2 Configuration 2 Single UPS Module, Isolated Bypass. In this configuration (Fig 10), a bypass transformer is used to feed the bypass input of the UPS module. The bypass transformer and UPS module together constitute a separately derived system, since there is no direct electrical connection between the input (service entrance) circuit conductors and the output circuit conductors. 1 Grounded/Grounding Conductor Arrangement. Since this configuration is considered a separately derived source, the neutral of the UPS module should be bonded to the equipment grounding conductor, and a local grounding electrode module should be installed, per NEC [1], 250-26.

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