Is it safe to put an extension cord in a wall?

Using extension cords in walls is generally not recommended. Extension cords are designed for temporary, portable use and running them through walls can create safety hazards.

Why You Should Not Put Extension Cords in Walls

There are a few key reasons why it is not safe to embed extension cords in walls:

• Fire hazard – Extension cords lack the proper insulation and gauge wiring for permanent in-wall use. This can lead to overheating and fires.
• Electrical code violations – Putting extension cords in walls goes against electrical codes and safety standards.
• Unsafe connections – The plugs and sockets on extension cords are not meant for permanent connections. They can loosen over time leading to arcing, sparks and fires.
• Insufficient wire gauge – Extension cords often use smaller gauge wires than standard in-wall electrical wiring. Smaller wires cannot safely handle higher electrical loads.

Are There Any Exceptions?

There are a few limited cases where using an extension cord in a wall may be acceptable:

• As a very temporary connection – Running an extension cord in a wall to power something for a day or two may be okay provided it is properly secured.
• Low power devices – Using thin gauge extension cords for things like LED lights that draw very little power is less risky.
• Inaccessible areas – Fishing a new wire may not be feasible in some old homes. An extension cord might be used in this case provided proper precautions are taken.

However, in most situations it is best to avoid putting extension cords in walls altogether. The risks generally outweigh any minor conveniences.

Hazards of Embedding Extension Cords in Walls

Here is more detail on the types of hazards created when extension cords are installed inside of walls:

Fire Hazards

Extension cords are not designed to handle the heat buildup that can occur with higher electrical loads over sustained periods. Running extension cords inside walls also bypasses any overcurrent protection built into the cord itself. This creates a serious fire risk that generally makes the practice prohibited under electrical codes.

Unsafe Connections

The sockets and plugs on most extension cords are not rated for permanent connections. They can loosen over time leading to arcing, sparks and potential fires. The cords also lack strain relief to prevent tugging and loosening at the connections.

Damaged Insulation

Insulation damage can occur when extension cords are pulled through walls, baseboards, ceiling or door frames. The insulation can get nicked or scraped leading to exposed conductors. Any breach in the insulation exposes surrounding flammable material to electric shock and fire hazards.

Overloaded Circuits

People often use extension cords improperly to add outlets in places where they need more capacity. Overloading extension cords in this way is dangerous. It creates heat buildup and the risk of fires. Proper new wiring should be installed to add electrical capacity safely.

Electrical Code Violations

Most building codes and electrical standards prohibit the use of extension cords as permanent wiring. Cords running through walls violate National Electrical Code regulations. This can cause issues with inspectors and insurance policies if ever discovered.

Safe Alternatives to Extension Cords in Walls

Instead of embedding extension cords in walls, there are safer options to add electrical capacity or outlets:

• Hire an electrician – Have additional in-wall wiring and outlets professionally installed to meet electrical code.
• Surface mounted raceways – Raceways let you safely run cords along walls without going inside them.
• Power strips – Use a surge protector or power strip to add outlets without wiring.
• Outlet expanders – Expanders plug into existing outlets to split them into multiple ports.

While these may involve more work than just using an extension cord, they are far safer alternatives according to electricians.

Key Takeaways

To summarize, embedding extension cords in permanent structures should be avoided in most cases due to safety concerns including:

• Fire hazards from overheating and overloaded wires
• Unsafe connections not meant for permanent installation
• Breached or damaged wire insulation
• Electrical code violations

Safer options include installing new wiring, using raceways or outlet expanders, or simply positioning a power strip or extension cord safely along a wall rather than inside it. While there may be some exceptions in certain circumstances, the general consensus is that extension cords do not belong inside of walls or ceilings.

Pros	Cons
Quick and easy Adds outlets without wiring	Fire hazard Electrical code violations Unsafe connections Can overload circuits

Frequently Asked Questions

Is it against electrical code to put an extension cord in the wall?

Yes, running extension cords through walls goes against the National Electrical Code and most local building codes. Extension cords lack the proper insulation and gauge for permanent in-wall wiring.

Can I put an extension cord in the wall if it is only temporary?

It is still not recommended, but using an extension cord in the wall very temporarily (for a day or two) is less risky if absolutely necessary. The cord must be properly secured and not overloaded.

What gauge wire should be used for in-wall wiring?

For standard 15 and 20 amp household circuits, code requires a minimum of 14 gauge wire for power and 12 gauge for 20 amp circuits. An extension cord may use 16 or 18 gauge wire that is unsuitable for permanent in-wall wiring.

Is it okay to use an extension cord for a ceiling light?

No, running extension cords through ceiling electrical boxes is dangerous and violates electrical code. Proper wiring should be installed to supply electrical to a new or relocated light safely.

Can I bury an extension cord underground outside?

Burying extension cords is also dangerous and should be avoided in most cases. Outdoor-rated direct burial cables should be used for supplying power underground outside.

Conclusion

While it may seem convenient, installing extension cords inside of walls is extremely hazardous and violates electrical codes. The risk of overheating, damaged insulation and unsafe connections is very high. There are safer ways to add outlets and capacity where needed. In summary, it is not recommended to put extension cords in walls except in very limited temporary scenarios. Following electrical codes and best practices avoids potential fires and shock hazards.