Installation Component | Average Cost |
Labor | $200 - $500 |
Power Inlet Box (optional) | $20 - $100 |
Heavy Duty Power Cord | $30 - $350 |
The total cost can be from $400 to $2,500. The price depends on the type of transfer switch and how hard it is to install. Manual switches cost less and are easier to put in. Automatic switches are easier to use but cost more.
When you connect a generator to your house, a transfer switch is the safest and best way. This setup protects your family, your home, and utility workers. Always follow the rules and use a licensed electrician for the job. With the right equipment and help, you can feel safe during any power outage.
Interlock Kit Connection
What Is an Interlock Kit
An interlock kit is a device you put on your main electrical panel. It lets you safely change from utility power to generator power during an outage. The interlock kit has a sliding or locking part. You must turn off the main breaker before turning on the generator breaker. This stops both breakers from being on together.
Using an interlock kit stops electrical backfeed. Backfeed is when power from your generator goes into the utility lines. This can hurt workers and break equipment. The interlock kit makes sure only one power source is used at a time. Many people like this method because it is safe, saves money, and works well for connecting a generator.
Tip: An interlock kit is helpful if you want to power many circuits in your house with a portable generator. It gives you more choices than using extension cords.
Equipment Needed
Before you connect a generator with an interlock kit, get these things:
Interlock kit that fits your panel
Portable generator (like a diesel generator or silent generator from DONGCHAI POWER)
Generator power inlet box
Heavy-duty generator cord
Circuit breaker for generator input
Insulated tools
Safety gloves and goggles
Labels for the panel and breakers
Always check if your panel works with the interlock kit. The right fit keeps things safe and working well.
Installation Steps
Follow these steps to put in an interlock kit for your generator:
Turn off the main power at your panel.
Make sure your interlock kit fits your panel and breakers.
Put the generator circuit breaker in an open slot.
Attach the interlock kit to the panel cover as the instructions say.
Drill holes if you need to, using the right drill bit.
Make sure the interlock plate moves smoothly between the breakers.
Connect the generator inlet box to the new breaker with the right wires.
Label all breakers and the panel to show where the generator connects.
Test the interlock kit. Make sure you cannot turn on both breakers at once.
Start your generator and check that the right circuits get power when you switch from utility to generator.
Note: You must hire a licensed electrician for this job. Working with electrical panels is dangerous. A professional will make sure your system follows the National Electrical Code and local rules.
Safety Tips
You must follow safety rules when using an interlock kit with a generator:
Never try to install an interlock kit if you are not trained.
Always turn off all power before opening your panel.
Use insulated tools and wear safety gear.
Make sure your interlock kit is UL listed and fits your panel.
Test the interlock kit after you install it.
Label all generator connections clearly.
Do not overload your generator. Only use circuits that match its output.
Check your system often for loose parts or damage.
If you install an interlock kit the wrong way, it can be very risky. You might not have enough backfeed protection. This can send power into utility lines and put workers in danger. It can also hurt your home's electrical system, break appliances, or start a fire. You must use a licensed electrician to stay safe and keep your warranty and insurance.
⚠️ Warning: Installing an interlock kit needs knowledge of wiring and circuit breakers. Local codes may have extra rules. Always follow NEC Article 702.5 and 702.6. These rules say you must stop both power sources from being on at once. Only a licensed electrician can make sure your setup is safe and follows the code.
At DONGCHAI POWER, we have many generator options, like diesel generator and silent generator models. Our products work well with interlock kit systems for safe backup power at home. We have helped many people get a safe generator connection with good support and quality equipment.
Testimonial:
"I picked a DONGCHAI POWER diesel generator for my house. The interlock kit was easy to install, and now I feel safe during outages." — Satisfied Customer
If you want to connect a generator to your house safely, think about using an interlock kit with a good generator set. Always use a professional for installation and pick equipment that meets all safety rules.
Power Inlet Box Connection
What Is a Power Inlet Box
A power inlet box lets you safely hook up your generator to your house. You put this box outside, close to your main electrical panel. When you need backup power, plug your generator into the box with a strong cord. The box keeps the connection safe from rain and wind. This setup lets you run your generator outside, far from doors and windows. This helps keep your home safe from carbon monoxide.
Equipment Needed
To set up a power inlet box, you need:
Power inlet box that matches your generator’s output (like 30 or 50 amps)
Heavy-duty generator cord with the right plug (for example, NEMA L14-30)
Generator (such as a diesel generator or silent generator from DONGCHAI POWER)
Circuit breaker for the generator input
Wire that is the right size (aluminum or copper, as the rules say)
Insulated tools and safety gear
Warning labels for the generator’s neutral bonding
Always make sure your equipment fits your generator’s power and your home’s system.
Installation Steps
Here are the steps to install a power inlet box for your generator:
Pick a spot outside for the power inlet box. Make sure it is safe from weather, secure, and easy to get to.
Turn off the main breaker before you start any work.
Attach the power inlet box to an outside wall near your main panel.
Run the right size wire from the box to your transfer switch or interlock kit inside.
Connect the ground wire to the main panel’s grounding bar. Also, connect the generator frame to a grounding rod outside.
Put in a breaker interlock or transfer switch so both utility and generator power cannot run at the same time.
Label the inlet box and panel with the generator’s neutral bonding.
Use GFCI protection if the box is in a wet place.
Test the system by plugging in your generator and switching power sources.
Tip: Always hire a licensed electrician to do this work. This makes sure your system follows the rules and keeps your home safe.
Safety Tips
You must follow safety rules when using a power inlet box with your generator:
Never run generator wires in the same pipe as utility wires.
Do not put the box near pools or hot tubs to avoid shock.
Use the right wire size and tighten all terminals to stop loose connections.
Check for loose wires or worn parts, as these can cause power loss or fire.
Change blown fuses and reset tripped GFCI outlets when needed.
Watch your system while it runs and turn off the main breaker before you connect your generator.
Get regular checks to find problems early.
⚠️ Warning: Loose wires or old parts can cause heat, sparks, or fire. Always have a professional check your system if you see any problems.
A power inlet box gives you a safe way to connect your generator for backup power at home. If you follow safety rules and use good equipment, you keep your home and family safe.
Ways to Connect a Generator with Extension Cords
When to Use Extension Cords
You can use extension cords if you only need to power a few things during a blackout. This is good for short-term use and for running important items like your fridge or a lamp. Extension cords cannot power your whole house. Only use them with a portable generator for simple backup power. If you want to run things like ceiling fans or your furnace, you need a different way to connect your generator.
⚠️ Important: Never plug a generator into a wall outlet. This can cause backfeeding. Backfeeding is very dangerous and against the law in many places.
Equipment Needed
You need the right things to use extension cords safely with your generator:
Heavy-duty extension cords made for outdoor use
Cords with copper wires for better safety and power
Cords with the right amps and volts for your generator (usually 125 volts or more)
Plugs that fit your generator’s outlets (like 30-amp or 50-amp)
A portable generator that can run your important items
Always check your cords before you use them. Look for any cuts, frays, or worn spots.
Steps for Safe Use
Follow these steps to use extension cords safely with your generator:
Put your portable generator outside, far from doors and windows.
Pick heavy-duty cords that are not too long and have the right wire size. Shorter cords give more power.
Plug the cord into the generator’s outlet.
Only plug in the most important things. Do not use too many things at once.
Check cords for damage before and while you use them.
Keep cords off wet ground so you do not get shocked.
Turn off the generator before you unplug anything.
Appliance | Recommended Cord Rating | Maximum Cord Length |
Refrigerator | 12-gauge, 15 amps | 50 feet |
Sump Pump | 10-gauge, 20 amps | 100 feet |
Lamp | 14-gauge, 10 amps | 50 feet |
Limitations and Risks
Extension cords have many limits when you connect a generator to your house:
You cannot use them for hardwired things like ceiling lights or water heaters.
Extension cords are only for short-term and simple needs.
Long cords lose power and make your devices weaker.
Using the wrong wire size can make cords hot or break them.
Some cords are not safe enough for generators.
Electrical rules do not always cover extension cords for generators, so it is harder to follow the rules.
If you use them wrong, you could cause backfeeding. This can shock people, start a fire, or break your generator.
Extension cords are not good for long-term or whole-house use. Transfer switches or interlock kits are much safer.
Tip: Always use cords with the right labels and ratings. If you need to power more than a few important things, look for safer ways to connect a generator to your house.
General Generator Safety
Preventing Backfeed
You must stop backfeed when you use a generator. Backfeed is when power from your generator goes into utility lines. This can shock utility workers and neighbors. The safest way to stop backfeed is with a transfer switch. A transfer switch keeps your generator power away from the utility grid. For bigger generators, you can use reverse power relays. These devices block power from going the wrong way.
Tip: Never plug your generator into a wall outlet. This is very dangerous and can cause backfeed and injuries. Always follow the manufacturer's instructions and local rules for safety.
Key steps to prevent backfeed:
Put in a transfer switch before you connect your generator to your house.
Only use heavy-duty extension cords with the right rating.
Turn off the main breaker before you hook up your generator.
Check all connections often to make sure they are not damaged.
Carbon Monoxide Safety
Carbon monoxide (CO) is a deadly gas you cannot see or smell. Generators make CO when they run. You must use good safety steps to keep your family safe. Always use your generator outside, far from windows, doors, and vents. Never use a generator inside your house, garage, or basement.
Warning: Opening windows or using fans will not keep CO out of your home.
Follow these safety precautions:
Put your generator at least 20 feet from your house.
Put carbon monoxide alarms on every floor and near bedrooms.
Test alarm batteries often and change them when needed.
If the alarm goes off, go outside right away and call for help.
If you feel dizzy or sick, leave the area fast.
Statistic / Fact | Details |
Annual CO deaths from generators in the U.S. | 85-100 per year |
Most deaths occur | In homes during power outages |
Key advice | Never use generators indoors; always use CO alarms |
Generator Placement
Putting your generator in the right spot keeps you safe. It also helps your generator work well. Always use your generator outside. Keep it at least 20 feet from your house. Point the exhaust away from windows and doors.
Do not use your generator under decks, overhangs, or in sheds.
Leave at least 3 feet of space around the generator for air.
Make sure the ground is dry and flat.
Look for cracks or holes near windows and doors that could let in exhaust.
Always follow local rules and the manufacturer's guide for where to put your generator.
Note: Good placement lowers the risk of fire and carbon monoxide poisoning.
Maintenance Tips
Doing regular checks keeps your generator safe and ready. You should look at your generator every week. Check for leaks, look at fluid levels, and make sure it starts easily.
Run your generator for 30 minutes each week to keep it ready.
Check oil and coolant every two weeks.
Look around your generator for trash or animals each month.
Get a professional to check your generator twice a year.
Write down all checks and repairs in a log.
Maintenance Interval | Tasks |
Weekly | Run generator, check for leaks, test start-up |
Bi-Weekly | Check oil and coolant levels |
Monthly | Inspect area, check battery and wiring |
Semi-Annual | Professional inspection and service |
Annual | Replace filters, change oil, test under load |
Doing regular maintenance helps your generator last longer and work when you need it.
You make your home safer by using a transfer switch, interlock kit, or power inlet box with your generator. Always get a licensed electrician to do the work. Follow all local rules and codes. Check your generator often and keep it in good shape. This helps your generator work for a long time.
Always put your generator outside. Store fuel in a safe place. Wear safety gear when you use your generator. These steps help keep your family and home safe.
FAQ
How do you choose the right size generator for your house?
First, add up the wattage of everything you want to power. Pick a generator set with more wattage than your total. This helps keep your home safe. It also makes sure your generator works well.
Can you connect a generator to your house without a transfer switch?
You should not connect a generator without a transfer switch or interlock kit. These devices stop backfeed and protect utility workers. Always use equipment that follows safety rules and codes.
Where should you place your generator during use?
Put your generator outside, at least 20 feet from your house. Keep it far from windows and doors. Make sure the spot is dry and has good airflow.
What maintenance does a diesel generator need?
Check oil and coolant levels often. Run your generator every week. Look for leaks or damage. Get professional service two times each year. Write down all checks and repairs in a log.
Why should you hire a licensed electrician for installation?
A licensed electrician knows local codes and safety rules. This lowers the risk of fire, shock, or damage. You also keep your warranty and insurance safe.
