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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Capstone MicroTurbine Electrical Installation 3.2. Grounding the Microturbine Neutral All installations, for both GC and SA modes, must have the neutral wire properly grounded. This provides a ground reference for proper operation. Neglecting to properly ground the microturbine system (that is, no neutral-to-ground connection, or more than one neutral-to- ground connection) can cause damage to the microturbine system. All electrical wiring, including protection and grounding, must conform to all local and national electrical codes and regulations. 3.2.1. Grounding Location It is recommended to ground the neutral wire(s) in only a single location, unless local code requires more than one connection. For example, it is sometimes required by local code to ground the neutral before the conductor leaves one building and travels into another, in case the neutral is broken during earthmoving activities. In the case of multiple grounding points, these grounding points should be at equivalent earth potentials; otherwise circulating currents can occur and provide a poor reference for operation. For GC installations, the recommended location of the neutral-to-ground connection is at the utility service panel or the utility service transformer. A neutral-to-ground connection is often already present at the wye utility service transformer. For SA and DM installations, the recommended location of the neutral-to-ground connection is at the microturbine service panel. Use of four-pole breakers may necessitate multiple neutral-to- ground connections, and more information is provided on this subject in Section 6. If multiple neutral-to-ground connections are required, please contact Capstone Applications Engineering for approval. 3.2.2. Grounding Potential A high-resistance ground should not be necessary, due to the very low fault current contribution of the microturbine(s)2. However, a high-resistance ground may be possible, and will require a modification to the microturbine as well as additional external surge protection equipment (to be supplied by the installer). Please contact Capstone Applications Engineering for approval. 1 Measurable at 5 ohms or less ground resistance per NEC, NFPA, and IEEE recommendation 2 Approximately 2X nominal current 410009 Rev F (October 2013) Page 7 of 31 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. WARNING: A solid earth ground1 of the microturbine neutral is MANDATORY for successful operation. WARNING: Any high-resistance grounding scheme MUST BE APPROVED BY CAPSTONE PRIOR TO COMMISSIONING.PDF Image | Technical Reference Capstone MicroTurbine Electrical Installation
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