Xantrex Technology PV100S-480 Conductor and Conduit Sizing, To calculate the proper conduit size

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Conductor and Conduit Sizing

Conductor and Conduit Sizing

All wiring methods and materials shall be in accordance with the National Electrical Code ANSI/NFPA 70. When sizing conductors and conduits interfacing to the PV100S, both shall be in accordance with the National Electric Code ANSI/NFPA 70, as well as all state and local code requirements.

Large gauge wire must conform to the minimum bend radius dependent upon the wire gauge (refer to the National Electric Code, Article 373-6B (Ninth Edition).

CAUTION: Equipment Damage

Be careful to keep the wire bundles away from any sharp edges which may damage wire insulation over time.

The following provides information on sizing the conductors and conduits for the system.

To calculate the proper conduit size:

1.Determine the required cable ampacity.

2.Determine the conduit length between the inverter and the transformer.

3.Determine the proper size for the cable according to the allowable ampacities indicated by NEC Table 310.16 (Ninth Edition).

4.Determine the proper size for the conduit.

The following is an example of the steps outlined above. Assumptions were made in this example which may not match your application, and the resulting design may not comply with all code requirements. Consult a licensed electrician on recommendations for specific installations.

Step 1. Determine the required cable ampacity.

AC Phase Cables from Inverter to Transformer:

100 kW / 208 Vac / 1.732 = 277.5 Arms (full load current) 277.5 x 125% = 347 A (required ampacity)

Step 2. Determine the conduit length between inverter and transformer.

•If the conduit length between the inverter and the transformer is less than 24 inches, then the cable can be sized using the NEC Table 310.16

(in Raceway) (Ninth Edition).

•If the conduit length is greater than 24 inches, then the cable must be sized using NEC Table 310.16 (in Raceway) (Ninth Edition) and by using the adjustment factors in NEC TAble 310-15(b)(2)(a).

152315 Rev C

2–11

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Contents PV100S 100 kW Grid-Tied Photovoltaic Inverter Page PV100S 100 kW Grid-Tied Photovoltaic Inverter Date and Revision Scope PurposeAudience OrganizationFollowing conventions are used in this guide Conventions UsedRelated Information Abbreviations and AcronymsPage Important Safety Instructions Personal Safety General Safety PrecautionsSafety Equipment Wiring RequirementsSafety Lockout and Tag Operational Safety ProceduresDe-Energize/Isolation Procedure Interconnection Standards ComplianceTo isolate the PV100S Xii Contents Installation SchematicsVerification Tables Xvi Figures Figures Introduction Description of the PV100S 1Dimensions Not to scale Electrical Specifications System SpecificationsSystem Ground Requirements 3Environmental Specifications Environmental SpecificationsOperator Interface Controls Main Enclosure Door Interlock Switch3On/Off Switch On/Off SwitchAC and DC Disconnect Switches Communication FeaturesData Logging System Status and Fault ReportingUniversal Front Panel Control Unit Ufcu Communication Methods6PC Connections in the Communications Enclosure PC Connection MethodsPots Access Ethernet LAN Access Planning Overview of PV100S Installation PV Planning Ventilation and Serviceability RequirementsSystem Neutral Requirements Ground RequirementsCommunication Requirements Utility Side Isolation Transformer RequirementsElectrical Diagrams and Schematics Model PV100S-480Model PV100S-208 1PV100S Layout Option a Layout Options2PV100S Layout Option B 3Conduit Entry Figure Reference Conduit Penetration15 cm 12 30 cm 10.5 27 cm Conductor and Conduit Sizing To calculate the proper conduit sizeDetermine the required cable ampacity Size the conduit Size the cable29 73.7 cm 16 ¼ 40.6 cm Anchoring the PV100S10AC Interface/Transformer Anchor Bolt Pattern Not to Scale Installation Unloading Equipment RequiredUnpacking the PV100S Moving the PV100SRemoving the Pallet and Moving the PV100S To move the PV100S using a forkliftTo mount and anchor the PV100S Mounting and Anchoring the UnitsTo lock or unlock the front door on the main inverter Opening or Closing Access DoorsTo Close Access Door To Open Access Door7Transformer Access Panels To install the conduits Conduit InstallationWiring General Conductor Termination Overcurrent ProtectionGrounding Wire Gauge and Torque RequirementsUtility Side Isolation Transformer Requirements System Neutral RequirementsAC Connections Wiring Specific13Tie-wraps on the AC Sense Harness 15AC Terminal Connections in the Main Inverter Enclosure To connect the utility service to AC Interface Enclosure 17Connecting the AC Sense Harness18AC Terminal Connections from the Utility 19PV Array Cable Routing and Terminations PV Array ConnectionsPC Communications Establishing a Pots Connection To connect a personal computer using the Pots ConnectionTo connect a personal computer using the GSM Wireless modem Establishing Wireless ConnectionDirect Connection If connecting the PC directly to the inverter22Direct Connect Installation Verification Verification Procedure Summary Visual Inspection of Electrical Connections Visual Inspection of Mechanical ConnectionsVisual Inspection, Isolation Transformer Wye/Wye Corrective ActionPerform after initial inspection if required Schematics This page intentionally left blank Figure A-1Electrical Diagram sample Schematics Appendix a Schematics Appendix a Schematics Appendix a This page was intentionally left blank Index IX-2 Rev C Page Xantrex Technology Inc