Xantrex DR1512W Installation And Operation Manual

Also see for DR1512E: Installation & operator's manual

Contents

Xantrex DR1512W Installation And Operation Manual Manual pdf 41 page image

DC Wiring975-0012-01-02 Rev A 2–17DC Disconnect and Over-current ProtectionFor safety and to comply with regulations, battery over-current protection isrequired. Fuses and disconnects must be sized to protect the wiring in the systemand are required to open before the wire reaches its maximum current carryingcapability.The National Electrical Code (NEC) requires both over-current protection and adisconnect switch for residential and commercial electrical systems. These itemsare not supplied as part of the inverter. However, Xantrex offers a DC rated, ETLListed, circuit breaker disconnect module specifically designed for use withXantrex™ inverters to meet NEC compliance. Two amperage ratings areavailable: a DC250 (250 amps) and a DC175 (175 amps) in either single or dualbreaker configurations for single- or dual-inverter installations.Some installations may not require conduit or a disconnect device, althoughover-current protection is still required. Xantrex offers a fuse block (TFB)providing the code required inverter over-current protection for these applications.Refer to the table below for the proper size disconnect device for specific cablediameters.Important: Xantrex™ DC disconnects are not designed to accept doubled(paralleled) cables which may be required for long cable runs. Also, the plasticred and black covers on the DC inverter inputs are not designed to accommodatedual cables. If dual cables are used, the optional conduit box (DRCB) must beused.Table 2-4 Battery Cable to Maximum Breaker/Fuse SizeCable SizeRequired Rating in ConduitMaximum BreakerSizeRating in “FreeAir”Maximum FuseSize#2 AWG 115 amps max N/A 170 amps max TFB200#2/0 AWG 175 amps max DC175 265 amps max TFB300#4/0 AWG 250 amps max DC250 360 amps max TFB400Important: The NEC allows rounding to the next standard fuse size from the cablerating (i.e., 150 amp cable size rounds up to a standard 175 amp size). The term “free air”is defined by the NEC as cabling that is not enclosed in a conduit or a raceway. Cablesenclosed in conduit or raceways have substantially lower continuous current carryingability due to heating factors.