What Would Cause Low Voltage in House Wiring? | Hunker The state of the wiring in an area is a common cause of voltage problems. Age and corrosion are a common cause of low voltage, as is dirty connections and poor insulation. Poor or damaged splicing work can also be a cause. In some cases, the wires used to carry electricity have a Low Voltage Electrical Wiring & Lighting Systems Low voltage wiring & control system inspection, troubleshooting, repair, repalcement, upgrades. Home page for our diagnosis and repair guide for low voltage electrical wiring typically used to control 120V home lighting, electrical receptacles, and other devices. Low Voltage Lighting System in Older Home - Identify Your Sierra Electric low voltage wiring systems use straps that are similar in look to other series'. The major difference is that the Sierra switches fit into switch plate openings that are rounded on the ends known as Despard switches. This is in contrast to typical low voltage series that have rectangular switchplate holes.