JHN Glossary — Electrical

Electrical Terms
Plain English.

Every term your electrician uses — explained clearly so you know exactly what you're agreeing to.

Conduit

Electrical

Conduit is a protective tube or channel that houses and protects electrical wiring. It can be metal (EMT or rigid) or plastic (PVC). Conduit is required in exposed areas like garages, attics, and exterior walls where wiring could be damaged. In NE Florida's humid climate, proper conduit installation prevents moisture damage and pest intrusion into wiring systems.

What contractors won't tell you: Some electricians will run exposed wiring without conduit in areas where it's required by code — cutting corners on installation cost. This creates both safety hazards and potential code violations that can affect your homeowner's insurance and home resale value. Always ask your electrician whether conduit is required for any exposed wiring in your project.

Dedicated Circuit

Electrical

A dedicated circuit is an electrical circuit that serves only one appliance or outlet. Large appliances like refrigerators, dishwashers, washing machines, dryers, microwaves, and HVAC systems require dedicated circuits to prevent overloading. In NE Florida, EV chargers and home generators also require dedicated circuits. Running high-draw appliances on shared circuits is a common cause of tripping breakers and potential fire hazards.

What contractors won't tell you: Some electricians recommend a full panel upgrade when the real solution is simply adding one or two dedicated circuits for specific appliances. Adding a dedicated circuit costs $150-$300 in most cases. Always ask if a dedicated circuit would solve the problem before approving a full panel upgrade.

Surge Protector / Whole Home Surge Protection

Electrical

A whole home surge protector is installed at your electrical panel and protects every outlet and appliance in your home from voltage spikes caused by lightning, utility switching, or large appliances cycling on and off. NE Florida's frequent lightning storms make whole home surge protection especially valuable. Unlike power strip surge protectors, whole home units protect appliances that can't be unplugged — like HVAC systems, water heaters, and refrigerators.

What contractors won't tell you: Whole home surge protectors cost $150-$300 installed — a fraction of what a single lightning strike can cost in damaged appliances and electronics. Some electricians don't mention this option at all during panel work or HVAC installations. Always ask about whole home surge protection any time electrical work is being done at your panel.

Aluminum Wiring

Electrical

Aluminum wiring was commonly used in NE Florida homes built between 1965 and 1973 as a cheaper alternative to copper. While aluminum wiring itself isn't inherently dangerous, it expands and contracts more than copper, which can cause connections to loosen over time — creating fire hazards. Homes with aluminum wiring require special outlets, switches, and connection methods to be safe.

What contractors won't tell you: Some electricians will recommend complete rewiring of an aluminum-wired home when the safer and less expensive solution is to use approved aluminum-to-copper connectors (called AlumiConn or similar) at each connection point. Full rewiring costs $8,000-$15,000. Proper remediation with approved connectors can cost a fraction of that. Always get a second opinion before approving a full rewire on an aluminum-wired home.

Load Calculation

Electrical

A load calculation determines how much electrical capacity your home needs based on square footage, appliances, HVAC systems, and other electrical demands. It's the proper way to size an electrical panel, EV charger, or any major electrical upgrade. A Manual J load calculation ensures your system isn't undersized or oversized for your actual needs.

What contractors won't tell you: Many electricians skip the load calculation entirely and recommend panel sizes based on habit or upsell opportunity rather than actual need. If an electrician recommends a 200-amp panel upgrade without performing a load calculation first, ask why. An unnecessary upgrade from 150 to 200 amps can cost $1,500-$2,500 with no real benefit.

Grounding

Electrical

Grounding is a safety system that provides a path for excess electrical current to safely discharge into the earth in the event of a fault. A properly grounded electrical system protects people and appliances from dangerous voltage spikes. In NE Florida, proper grounding is especially important due to the high frequency of lightning strikes. Ungrounded outlets — common in older homes — are a safety hazard and can damage sensitive electronics.

What contractors won't tell you: Some electricians quote full rewiring jobs when a home has ungrounded outlets, when in many cases a simpler and less expensive solution exists. Adding GFCI protection to ungrounded outlets is a code-accepted alternative to full rewiring in many situations. Always ask about all available options before approving a full rewire.

Arc Fault Circuit Interrupter (AFCI)

Electrical

An AFCI breaker detects dangerous arc faults — unintended electrical discharge that can cause fires — and shuts off the circuit before a fire starts. Unlike standard breakers that only trip on overloads, AFCIs detect the subtle electrical signatures of arcing. Modern building codes require AFCI protection in bedrooms, living rooms, and most areas of new construction in Florida.

What contractors won't tell you: AFCI breakers cost $30-$50 each versus $5-$10 for standard breakers. Some electricians will recommend replacing all breakers with AFCIs during any panel work — significantly inflating the bill. Ask specifically which circuits require AFCI protection by code and which are optional before approving a full AFCI upgrade.

Electrical Panel

Electrical

The electrical panel (also called a breaker box or load center) is the main distribution point for electricity in your home. It receives power from the utility company and distributes it through individual circuits protected by breakers. Most NE Florida homes have 100-200 amp panels. An undersized or outdated panel can be a safety hazard and may not support modern electrical demands.

What contractors won't tell you: Panel replacements are one of the most oversold electrical jobs. Some electricians recommend full panel replacement when a simple upgrade or individual breaker replacement would suffice. Always get a second opinion before approving a full panel replacement. Also ask specifically if your panel brand has known safety issues — certain older brands like Federal Pacific and Zinsco have documented failure rates.

Electrical Panel

Electrical

The electrical panel (also called a breaker box or load center) is the main distribution point for electricity in your home. It receives power from the utility company and distributes it through individual circuits protected by breakers. Most NE Florida homes have 100-200 amp panels. An undersized or outdated panel can be a safety hazard and may not support modern electrical demands.

What contractors won't tell you: Panel replacements are one of the most oversold electrical jobs. Some electricians recommend full panel replacement when a simple upgrade or individual breaker replacement would suffice. Always get a second opinion before approving a full panel replacement. Also ask specifically if your panel brand has known safety issues — certain older brands like Federal Pacific and Zinsco have documented failure rates.

Circuit Breaker

Electrical

A circuit breaker is a safety switch that automatically shuts off electrical flow when a circuit is overloaded or shorted. It protects your wiring from overheating and causing fires. Circuit breakers are housed in your electrical panel and each one controls a different area or appliance in your home. A breaker that trips repeatedly is a sign of an underlying problem that needs to be addressed.

What contractors won't tell you: A repeatedly tripping breaker is sometimes used to justify a full panel replacement when the real issue is a single faulty appliance or overloaded circuit. Before approving a panel upgrade, ask your electrician to identify exactly which circuit is tripping and why. A panel upgrade costs $2,000-$4,000 — make sure it's actually needed.

GFCI Outlet

Electrical

A GFCI (Ground Fault Circuit Interrupter) outlet is a safety device that shuts off power instantly when it detects an electrical imbalance — protecting you from electrocution. GFCI outlets are required by code in bathrooms, kitchens, garages, and outdoor areas. They have two small buttons — Test and Reset — on the face of the outlet. If an outlet near water doesn't have these buttons, it may not be GFCI protected.

What contractors won't tell you: Some electricians will quote a full panel upgrade or rewiring job when the real fix is simply replacing a few GFCI outlets for $15-$30 each. If you're having outlet issues in wet areas, always ask specifically whether GFCI replacement was considered before approving anything larger.
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