Knob-and-Tube, Two-Prong, and Pre-1972 Wiring: Why It No Longer Meets Code
Knob-and-tube, two-prong outlets, and pre-1972 wiring no longer meet code. Here is what they are, why they matter, and how we bring them up to standard.
Knob-and-tube, two-prong outlets, and pre-1972 wiring no longer meet code. Here is what they are, why they matter, and how we bring them up to standard.
Aluminum branch wiring is a connection problem, not a reason to panic. Here is why it is a concern in older homes and the proven fix that makes it safe.
Northern Virginia homeowners in Fairfax, Loudoun, Arlington, and Prince William Counties: learn the warning signs of a failing electrical system — aging panels, hardwired smoke detectors losing power, blown circuits, power problems, and a home that can't handle an EV charger — and find out what to do before something goes seriously wrong.
Many Northern Virginia homes from historic cottages in Arlington to sprawling new builds in Loudoun—are running on outdated or overloaded electrical panels. In this expert guide, Master Electrician Peter from PRO Electric plus HVAC explains how legacy systems like Federal Pacific and Zinsco pose serious fire risks, why 100-amp panels can’t handle today’s demands, and what upgrades—like 200-amp service, AFCI/GFCI protection, and outdoor disconnects—are essential for modern safety, efficiency, and peace of mind. Whether you’re dealing with frequent breaker trips, planning to install an EV charger, or simply want to ensure your home meets Virginia’s latest electrical code, this comprehensive guide breaks it all down—county by county.
PRO ELECTRIC plus HVAC
Find a tool. Plan a project. Get the right help.
Useful starting points for your next repair or project.
Switch example loads on and off to see how demand adds up.
SimulatorExplore household loads before discussing a breaker or panel concern.
GuideOrganize the outage details that help identify the right next call.
SimulatorCompare illustrated power events with and without a panel surge protector.
GuideChoose an observed warning sign for immediate next-step guidance.
PlannerAnswer four questions to prepare for a service-disconnect conversation.
PlannerBuild a useful brief for a renovation, addition, or wiring concern.
PlannerChoose your situation and concerns to prepare an inspection brief.
PlannerTurn a report or notice into questions and records for your electrician.
ChecklistCollect known alarm concerns into a service-request brief.
PlannerDescribe a device problem or upgrade and prepare a clear service request.
ServiceExplore electrical installation for a hot tub or spa.
ServiceRequest a professional review of your home’s electrical system.
ServiceExplore the electrical work for a home infrared sauna.
CalculatorCompare the time needed to replace a typical day’s driving.
SimulatorSee how an example EV charger changes simultaneous household demand.
PlannerSelect essential loads and an outage length to explore an energy target.
ServiceExplore standby generator options and installation for your home.
PlannerChoose your lighting goal and build a brief for your estimate.
ExplorerTry warm or cool light and switch between ambient, task, and accent layers.
PlannerSelect outdoor areas and controls to build a lighting brief.
FinderMatch an outdoor area and project goal to a useful planning brief.
ExplorerTry lighting layers for paths, steps, patios, and garden details.
CalculatorCompare electricity use and running cost for a group of lights.
PlannerChoose connected-home goals, a platform, and your project stage.
PlannerCompare the support, ceiling, and location details for your fan project.
FinderChoose your cooling goal and prepare for the next conversation.
GuideCollect observed symptoms and a short note for your service call.
ChecklistReview changes you have noticed and prepare a service conversation.
PlannerDescribe your space, ductwork, and priorities for an installation estimate.
PlannerBring system age, performance, and project goals into one planning brief.
GuideUse current observations to discuss a tune-up or another service visit.
GuideOrganize cooling-breakdown symptoms before you call for help.
PlannerTurn room-by-room comfort needs into a clear installation brief.
FinderChoose a heating goal and your equipment to organize the next step.
GuideDescribe what your heating system is doing and prepare a service note.
PlannerReview your equipment and service history, then plan a reminder.
PlannerPrepare questions about equipment, ducts, and comfort priorities.
CalculatorCompare quoted upfront amounts and annual energy costs over your chosen period.
PlannerExplore a heat-pump project using your goals and current equipment.
PlannerReview service history and set a personal reminder to arrange heating care.
ServiceReview what is involved in replacing your heating and cooling system.
PlannerMap home, away, and sleeping times for a thermostat planning note.
PlannerOrganize your equipment details and indoor-air goals for a service conversation.
PlannerCombine a humidity reading and window observations into a useful service note.
Try a shorter phrase such as “no heat,” “EV charger,” or “outlet.”
Ask our team for help