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They sit next to each other on the shelf, look the same, and often cost within a few dollars of each other. One of them gives you more places to plug things in. The other actually intervenes when the voltage spikes.

Telling them apart

A surge protector will advertise a joules rating, which is roughly how much surge energy it can absorb over its life. A plain power strip has no such rating because it has no protective components. It is a length of cord ending in several outlets, usually with a breaker or overload switch that protects against drawing too much, which is not at all the same as protecting against a spike coming the other way.

They wear out

This is the part that catches people. The components inside a surge protector degrade as they absorb surges. Each spike uses some of that capacity, and when it is gone the device keeps supplying power exactly as before, with nothing left to protect anything.

Better units have an indicator light labelled “protected”. If that light is out while the unit still works, the protection is finished. Many cheaper ones do not tell you at all.

Surge protectors are consumables. Treat an old one, or one that has been through a serious storm season, as suspect.

Where the surges actually come from

Lightning gets the attention, but most surges are small and routine, coming from large equipment inside your own home cycling on and off. These do not destroy anything at once; they wear electronics down over time.

In North Texas, storm season adds the larger kind, which is a good reason to take this seriously here.

Whole-home versus point-of-use

A whole-home surge protective device is installed at the panel and takes the first hit on everything entering the house, including hard-wired equipment that has no plug to protect: HVAC, ovens, the garage door opener.

Point-of-use protectors at a computer or TV handle what gets past it and what originates inside the house.

They are layers, not alternatives. Whole-home for the big events and anything hard-wired, point-of-use for sensitive electronics. Whole-home installation is panel work, so it is an electrician’s job rather than something you buy and plug in.

In a North Texas summer your air conditioner starts and stops many times a day, so this is one of the most-noticed electrical quirks in the region. It is also one of the most useful, because the character of the dim tells you a lot.

Why it happens at all

An air conditioning compressor is a large motor, and motors draw substantially more current in the instant they start than they do while running. That surge briefly pulls down the voltage across the system, and the lights show it. A momentary, slight dip when a big motor kicks on is ordinary and not a cause for concern.

When it stops being ordinary

Four things turn this from normal into worth investigating.

Depth. A barely perceptible flicker is one thing. Lights visibly dropping to half brightness is another.

Duration. The dip should be essentially instantaneous. If lights stay dim for a second or more, the motor is struggling to get going.

Change over time. This is the most valuable signal. If it never used to do this and now it does, or it has steadily got worse over a season, something is degrading.

Spread. If the dimming happens throughout the entire house rather than on one circuit, the cause is upstream, at the panel or the service itself.

What it can point to

On the equipment side, a failing start capacitor is a very common cause of a compressor that draws hard and long at startup. That is an HVAC repair, not an electrical one, and it is worth ruling in or out.

On the electrical side, it can indicate a loose or corroded connection in the panel or at the service entrance, an undersized or aging service for a house that now runs far more than it was built for, or a shared neutral problem. These are not DIY-diagnosable, and the service entrance in particular is not an area for homeowner investigation under any circumstances.

What is worth telling an electrician

How deep, how long, whole-house or one area, and whether it has changed. Those four details narrow the search enormously and make the visit shorter.

Almost every electrical complaint has a boring explanation available. A flickering light might be a loose bulb. A dead outlet might be a tripped GFCI two rooms away. This one is different. A burning smell at an outlet, switch or panel has no harmless version.

What you are smelling

The materials around electrical connections are plastics and insulation chosen to resist heat. When a connection is loose or overloaded, it heats up, and those materials begin to break down. That breakdown is what reaches your nose. People describe it as burning plastic, a sharp chemical smell, or sometimes a fishy odour, which is a known description of overheating electrical insulation.

The important thing is that the smell usually arrives before there is anything to see. By the time there is visible scorching, the condition has been developing for a while.

Why loose connections overheat

Electricity moving through a solid, tight connection generates very little heat. Through a loose one, it has to jump a small gap, and that resistance turns into heat at a single point. Connections work loose over decades through normal expansion and contraction. That is ordinary. The heat it produces is not.

What to do right now

Stop using the outlet or switch. Unplug what is connected to it, if you can do that without touching anything hot or damaged. If the smell is strong, if anything is discoloured, if you see smoke, or if the device is hot to the touch, shut off power to that circuit at the panel only if you can do it safely, and call a licensed electrician immediately. If there is smoke or you see fire, leave the building and call 911 first.

What not to do

Do not open the outlet to look. Do not keep using it because it still works. Do not assume it will clear up. An overheating connection does not repair itself, and “it still works” is not evidence that it is safe. The outlet working normally is exactly what it does right up until it does not.

Most of the decisions people agonise over, which brand, which features, matter far less than the three things that determine the job: where the car parks, what your panel can supply, and how far apart those two things are.

Level 1 versus Level 2

Level 1 is the cord that came with the car plugged into an ordinary outlet. No installation, very slow. For someone driving a short commute it can genuinely be enough, and it is worth being honest about whether it already covers your use.

Level 2 runs on a 240-volt dedicated circuit, like a dryer or a range, and is dramatically faster. This is what most people mean by installing a charger, and it is real electrical work: a new circuit, correctly sized, from the panel to where the car parks.

Why it is treated as a continuous load

EV charging runs at high current for hours at a time. The code handles continuous loads differently from intermittent ones, which affects how the circuit must be sized. This is a large part of why a charger that advertises a given current needs a circuit rated higher than that number.

The three cost drivers

Distance. Panel in the garage and the car parked ten feet away is a short run. Panel on the far side of the house with the car outside means a long run, possibly through finished walls or under a slab. This is usually the single largest variable.

Capacity. Not whether there is a free breaker space, but whether the service can actually supply the load. This needs a load calculation.

Mounting and path. Surface-run conduit in an unfinished garage is straightforward. Fishing through finished walls, or getting outside to a detached garage or carport, is more involved.

If capacity is short

A service upgrade is one answer but not the only one. Most Level 2 chargers can be configured to draw less current, trading some charging speed for a smaller circuit. There are also load management systems that let a charger share capacity with other large loads, backing off automatically when the house is busy. Either can be considerably cheaper than upgrading a service, and both are worth asking about before accepting that an upgrade is required.

Permits

A hardwired Level 2 installation is permitted work, and that is a good thing rather than a hurdle. It means an inspector verifies the circuit is sized correctly for a load that will run for hours, unattended, overnight, for years. Skipping it to save a few dollars is a poor trade, and unpermitted work surfaces when you sell.

There is nothing wrong with an extension cord used the way it was designed: temporarily, for a job, then put away. Most trouble comes from the other use, where a cord quietly becomes part of the house.

Under rugs

This is the one worth being firm about. A cord under a rug gets stepped on repeatedly, which damages the insulation inside where you cannot see it. It also sits under a layer of insulation that traps any heat the cord produces. Damage you cannot inspect plus heat that cannot escape, directly under something flammable.

Through doorways and under furniture legs

Same mechanism, concentrated at one point. A door closing on a cord dozens of times a day crushes the conductors inside. The outer jacket often looks fine long after the inside is damaged.

Undersized for the load

Cords carry a rating, and a thin cord intended for a lamp is not suitable for a space heater, window air conditioner, power tool or anything else that pulls real current. Heaters are the most common offender, because they run at high draw for hours.

Length matters too. The longer the cord, the more resistance, so a long thin cord feeding something hungry gets warm along its whole length.

The practical rule: a cord in use should be cool. If it is warm, it is working harder than it should be, and warm is the symptom that arrives before anything worse.

Daisy-chaining

Plugging strips into strips multiplies what a single circuit is feeding while putting several more connection points in the path. Each junction is another place to work loose.

Indoor cords used outside

Outdoor-rated cords have jackets built for moisture and sunlight. Indoor cords left outside degrade, and a damaged cord outdoors sits in exactly the conditions that make a fault dangerous.

The actual fix

If you have had an extension cord in the same place for more than a few weeks, that is the house telling you there is no outlet where you need one. Adding a receptacle is usually a modest job, and it permanently removes a hazard rather than managing it. Dedicated spots like garage workbenches, home offices and window units are the usual candidates.

Open a panel and you will see numbers stamped on the breaker handles. 15 and 20 mostly, with a few 30s and 50s. Those are amperage ratings, and the thing they are rated for is probably not what you would guess.

It is about the wire

Wire has a safe current-carrying capacity based on its thickness. Push more current through it than that and it heats up. Inside a wall, inside insulation, that heat has nowhere to go.

So the breaker is chosen to match the wire. A 15-amp breaker is there because the wire behind it is rated for roughly that. A 20-amp breaker sits on heavier wire. The breaker’s entire purpose is to cut power before the wire reaches a dangerous temperature.

This is why a larger breaker is not an upgrade. If someone puts a 20-amp breaker on 15-amp wire, the tripping stops, because the breaker now allows more current than the wire can safely carry. The nuisance is gone and so is the protection. This is one of the more common and more dangerous DIY “fixes” found during inspections.

What the common sizes are typically doing

15 amp is the standard for general lighting and ordinary outlets in bedrooms and living areas.

20 amp is typical for kitchen counter circuits, bathrooms, laundry and garages, where higher-draw appliances live. Modern kitchens require several of them.

30 amp commonly serves an electric dryer or a water heater.

50 amp is in range territory, and increasingly, EV charging.

What to do if a circuit is undersized

If a circuit trips because the way you use that room has outgrown it, which is extremely common in older homes with modern appliances, the correct answer is adding a properly sized circuit for the load, not making the existing breaker bigger. That is new wire, sized for the job, with a breaker matched to it. It is a straightforward piece of work and it solves the problem permanently rather than hiding it.

An electrical panel is the one piece of equipment in your house that every circuit depends on, and the one almost nobody looks at. It is usually in a garage or a utility closet, behind a door that stays shut for years at a time. It is worth opening that door twice a year and paying attention with your eyes, nose and ears.

Heat

The outside cover of a panel should be at room temperature. If the metal is warm, something inside is running hot. Warmth at a specific breaker is more specific still. Heat means resistance, and resistance in an electrical connection is how fires start.

Smell

A faint smell of hot plastic or burning near the panel is one of the most serious signals a home will give you. Melting insulation has a distinct sharp smell. If you can smell it, the condition is already advanced.

Sound

A panel should be silent. A steady hum or buzz, or an intermittent crackle, usually points to a loose connection arcing. Arcing is not something that settles down on its own.

What you can see

Brown or black discolouration around a breaker, rust anywhere inside the cabinet, or a breaker that looks different from the others are all worth a professional look. Rust is worth particular attention because it means water has been finding its way in, and water and panels do not coexist quietly.

Age and brand

A panel that is forty or fifty years old is not automatically dangerous, but it was designed for a house that used a fraction of the power yours does now. It also predates several protections that are standard today.

Separately, a few panel brands installed decades ago have known defects documented over many years, where breakers can fail to trip under fault conditions. If your panel is original to an older home, it is worth having someone identify what you actually have. That is an inspection, not a sales call, and a straight answer may well be that it is fine.

What to do

If you notice warmth, smell, buzzing or scorching, treat it as urgent. Shut off the main breaker only if you can reach it safely, leave the building if there is smoke, and call a licensed electrician. Everything else on this list is worth a scheduled inspection rather than a panicked evening.

This question usually arrives attached to something else: an EV charger, a kitchen remodel, a hot tub, or a home inspection that said something vague about the panel being old. Age by itself is not an answer.

Three separate questions

Is it safe? Overheating, scorching, rust, buzzing, a panel that has been worked on badly, or a brand with documented defects. These are reasons to replace regardless of capacity.

Is there room? A panel has a physical number of breaker spaces. Full is not the end of the story, since tandem breakers may be permitted depending on the panel, and some existing circuits may be able to be reorganised. But sometimes full is simply full.

Is there capacity? This is the one people skip. Your service has a rating, commonly 100, 150 or 200 amps. The question is not whether the panel has space but whether the service can actually supply what you intend to add.

What a load calculation does

There is a defined method in the electrical code for calculating a home’s demand: square footage, fixed appliances, HVAC, and the specific loads you are adding. It produces a number you can compare against your service rating.

This is the difference between an opinion and an answer. Done properly, it tells you whether you genuinely need more service or whether the existing one has headroom. It is also what a permit office will expect to see for significant additions.

The EV charger question

This is now the most common trigger, and the honest answer varies a lot. A Level 2 charger is a large continuous load. Some homes have plenty of room for it. Some do not. There are also chargers that can be set to lower current, and load management devices that let a charger share capacity, which sometimes avoids an upgrade entirely.

Anyone who answers “you’ll need a panel upgrade” before looking at your panel and running the numbers is guessing.

When it is genuinely the right call

When the service really is undersized for how the house is now used, when the panel has safety defects, when it is a known-problem brand, or when you are doing enough work at once that upgrading now avoids doing it twice. In those cases it is money well spent.

What to ask for

Ask what the load calculation shows, what specifically is wrong with the existing panel, and whether there is a smaller fix that solves your actual problem. A straight answer to those three is a reasonable expectation, and the answer may well be that you do not need one.

This takes about ten minutes and requires no tools, no ladder and nothing taken apart. It is not an inspection. It is a walk through the house paying deliberate attention to things you normally pass without a glance.

At the panel

Leave the cover on. Put the back of your hand near the panel door and then lightly on it. It should be at room temperature. Listen for a few seconds in a quiet house; you should hear nothing. Breathe in; you should smell nothing.

Look at the area around it. The panel should be clear and reachable, not blocked by storage. There is a code requirement for clear working space in front of a panel, and beyond the rule, you may one day need to reach it quickly in the dark.

Outlets and switches

Walk the house and rest a hand briefly on cover plates, particularly in the kitchen, the laundry area, behind the TV and anywhere a space heater or window unit gets used. They should be room temperature.

Look for browning or discolouration around the slots, plates that have cracked, and outlets where a plug falls out under its own weight. That last one means the internal contacts are worn, which makes for a loose connection, which makes heat.

GFCI outlets

Press TEST on each one. Power should cut with a click. Press RESET to restore it. If TEST does not kill the power, the outlet has lost its protective function even though it still works as an outlet, and it needs replacing.

Cords

Look behind furniture. You are looking for extension cords being used permanently, cords run under rugs or through doorways, several power strips chained together, and any cord that is cracked, taped or warm.

Outside

Check that outdoor outlet covers actually close and that the gaskets are intact. In North Texas this matters more than most places, because wind-driven rain finds any cover that no longer seals.

While you are at it

Press the test button on your smoke alarms. It is not strictly electrical, but you are already walking the house, and alarms are the single highest-value thing in it.

Write it down

Keep a note on your phone. “March: hallway outlet slightly warm.” In six months you will know whether that is unchanged or getting worse, and that comparison is worth more than any single observation.

During a stretch of the mid-1960s through the mid-1970s, copper prices pushed many builders toward aluminum for branch circuit wiring, the wiring that runs to your outlets and switches. A great many homes from that era have it. If your home is from that period, it is worth finding out.

The wire is not the problem

Aluminum conducts electricity perfectly well. Large aluminum conductors are still used today for service entrances and feeders, routinely and safely.

The issue with the older branch wiring is what happens at the ends. Aluminum expands and contracts more than copper as it heats and cools, which over many cycles can work a connection loose. It also oxidises differently, and that oxide layer adds resistance. Loose connection plus added resistance produces heat at that point, and that is the mechanism behind the concern.

On top of that, the devices of the era, the outlets and switches themselves, were not designed with aluminum in mind. Pairing the two made the connection problem worse.

How to tell what you have

Often it can be identified at the panel or at a receptacle without opening up walls, and sometimes the cable sheathing is marked. An electrician can usually tell you fairly quickly. That is the right first step, because plenty of people assume they have it based on the age of the house and turn out not to.

What gets done about it

Full rewiring is the most thorough answer and the most expensive, and it is not the only accepted one. There are recognised repair methods that address the connections specifically rather than replacing all the wire, and there are devices rated for use with aluminum. Which approach fits depends on what is actually found.

What is not an answer is a homeowner swapping outlets. Using devices not rated for aluminum on aluminum wiring makes the original problem worse, and it is a common well-intentioned mistake.

Why it is better to know

Aluminum branch wiring can come up with insurers and will almost certainly come up in a home inspection when you sell. Finding out on your own schedule is considerably better than finding out during a contract.