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<br />10 <br /> <br /> <br />Figure 4: Purple areas represent fire walkways incorporated into the design <br />Some challenges to connectfng the proposed array to the existfng electrical equipment are present. This is <br />primarily due to the presence of a transfer switch and the temporary use of a generator during power outages. <br />The use of a generator restricts where the solar array can be safely connected to existfng equipment as the <br />array must shut down in the event of a power outage. The array will not provide power during power outages <br />and is generally true of all solar arrays unless special equipment is installed. The array also cannot operate <br />alongside the generator. <br />This constraint, alongside the fact the utflity meter is located in the basement, forces the electrical connectfon <br />to also be made in the basement. <br />The inverter and a non-fused 100A disconnect switch will be mounted on the wall adjacent to the existfng <br />transformer, located south of the building. All DC wiring from the roof will come down the exterior of this wall <br />and terminate at the inverter. The wiring from the inverter will then go to the disconnect switch. This <br />disconnect is required by NEC and utflity rules and will allow the operator and first responders to safely <br />disconnect and turn off the solar array from the building exterior. Xcel Energy requires 24/7 unescorted access <br />to the existfng billing meter in the basement of the building currently and will contfnue to require this after <br />solar installatfon.