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Residential Case Studies

Home electrical projects including EV chargers, detached structures, and long circuit runs

Residential voltage drop challenges often involve long runs to detached garages, outbuildings, and pool equipment. With the rise of electric vehicles, Level 2 EV charger installations have become one of the most common residential projects requiring careful voltage drop analysis. These case studies demonstrate proper wire sizing techniques for home electrical projects.

EV charger installationhome chargingdetached garageresidential electricalLevel 2 EVSETesla charger
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ResidentialElectric Vehicles

EV Charger Installation: 200ft Run to Detached Garage

Sizing conductors for a 48A Level 2 EV charger with a long run from the main panel to a detached garage while meeting NEC voltage drop recommendations.

200 ft
Distance
48A
Load
2.8%
Final Drop
Challenge

The homeowner wanted to install a 48A Level 2 EV charger in their detached garage, 200 feet from the main panel. Initial calculations showed 4 AWG copper would exceed 3% voltage drop.

Solution

Upsized to 2 AWG copper conductors in PVC conduit. Verified ampacity compliance per NEC Table 310.16 and calculated final voltage drop at 2.8%.

Result

Successful installation with 2.8% voltage drop, well within NEC recommendations. Charger operates at full power with no issues.

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