Beatrice Lang
Running electricity outside of your house can be done in a variety of ways, depending on your needs. For example, if you need a temporary power supply outdoors, an extension cord designed for outdoor use can be a quick solution. However, for a more permanent solution, you may need to install outdoor electric wiring, either above or below ground. This can be a complex process, involving decisions about the type of cable to use, burial depth, and compliance with electrical codes and safety regulations. In some cases, it may be necessary to consult an electrician or refer to specific electrical codes for guidance.
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What You'll Learn
Burial depth and trench requirements
The burial depth and trench requirements for running electricity outside of your house depend on several factors, including the type of conduit, wire, or cable used, as well as local code requirements.
The National Electrical Code (NEC) sets the standards for burial depth, which range from 4 to 24 inches. The specific depth depends on the wiring method and the location of the buried wire. For example, rigid metal conduit (RMC) has a shallow burial depth of 6 inches, while underground feeder cable (UF) requires a depth of 12 inches. If you're using PVC conduit with individual insulated wires, the burial depth should be 18 inches.
It's important to note that local codes and regulations may vary, so it's always a good idea to check with your local electrical contractor or authority to ensure compliance.
The type of soil you have will also impact your trench requirements. If you have granular soil that is easy to dig, you may be able to save money on electrical materials by digging deeper and potentially avoiding the need for metal or plastic conduit to protect the wiring.
To protect your wiring and ensure safe installation, consider using burial tape along the trench to prevent someone from accidentally digging too deep and cutting into the wire. Additionally, a treated wood plank placed over the wiring can provide complete protection and reduce the required burial depth.
Remember, running electrical wiring outdoors can be a complex task, and it's essential to prioritize safety. If you're unsure about any aspect of the project, it's best to consult a certified electrician for guidance and assistance.
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Cable types and their installation
When running electrical wiring outside, it's important to select the right type of cable to ensure a long-lasting and efficient installation. The specific cable you choose will depend on your unique needs and the environment in which the cable will be installed. Here are some common cable types for outdoor use and their installation considerations:
- Underground Feeder Cable (UF): UF cable is designed for direct burial underground without the need for additional conduit. It can be used for both indoor and outdoor applications. The burial depth requirements for UF cable vary depending on the wiring method and location, as outlined by the National Electrical Code (NEC). It is important to check and adhere to these regulations to ensure safe installation.
- Non-Metallic Sheathed Cable (NM-B): NM-B cable is commonly used for running electrical wiring to outdoor structures like sheds. It is typically run from the shed disconnect switch to a ground-fault circuit interrupter (GFCI) receptacle and then to the rest of the shed outlets and lights. While NM-B cable can be used outdoors, it should not be directly buried and must be protected within conduit.
- Outdoor-Rated Ethernet Cable: These cables are designed for outdoor network installations and feature protective jackets that shield them from environmental factors such as moisture, sunlight, and temperature extremes. They are often rated as UV-resistant and waterproof, ensuring their durability in harsh conditions.
- Coaxial Cable (Coax): Coax cable can be used for running cable television to outdoor structures like a back house or garage. It can also be used for closed-circuit TV and powering video surveillance equipment. Coax cable can be directly buried or installed within conduit, depending on the specific type and rating.
- Speaker Wire: Speaker wire is commonly used for outdoor entertainment setups, such as connecting speakers in a backyard or gazebo. It is available in direct burial or outdoor-rated forms and can be installed underground or within conduit to maintain a neat appearance and prevent tripping hazards.
When selecting outdoor cables, it is important to look for specific labelling such as "UV-resistant", "direct burial", or "outdoor-rated". Certification marks like UL indicate compliance with durability standards. Additionally, consider the level of waterproofing required, as cables exposed to heavy rainfall or water sources should have higher waterproofing capabilities.
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Safety precautions and GFCI protection
Safety is a key consideration when running electricity outside of your house. Before you begin, it's important to understand the potential dangers of electrical work and the safety precautions to put in place.
Firstly, always keep yourself and your equipment at least 10 feet away from a power line. Electricity can jump to nearby objects, so it's crucial to maintain a safe distance. Research and plan before drilling or digging to avoid any underground electrical wires. Call 811 before you start any outdoor electrical work to locate these wires and ensure you don't accidentally cut into them.
Additionally, it's essential to use the correct type of wiring and burial depth for your project. The National Electrical Code (NEC) sets the rules for burial depth, which range from 4 to 24 inches, depending on the wiring method and location. For example, rigid metal conduit (RMC) has a shallower burial depth requirement of 6 inches, while underground feeder cable (UF) requires a depth of 12 inches.
Now, let's talk about GFCI protection. GFCI stands for Ground Fault Circuit Interrupter, and it's a safety device that helps protect you from electrical accidents, specifically shocks and electrocution. It senses the difference in the amount of electricity flowing into and out of a circuit and reacts quickly (in less than one-tenth of a second) to shut off the power if there's a discrepancy. This is important because tap water and wet objects can easily conduct electricity, increasing the risk of electrical shock.
GFCI protection is required for outdoor electrical installations. You can use a non-GFCI weather-resistant outlet outdoors as long as it is protected by an upstream GFCI device. There are three types of GFCIs: receptacle-type, circuit breaker, and temporary or portable. Receptacle-type GFCIs are the most common, resembling standard wall outlets. Circuit breaker GFCIs replace standard circuit breakers and provide protection to all receptacles on that circuit. Temporary or portable GFCIs are for outdoor use with power tools and should not be permanent fixtures.
Remember to test your GFCIs monthly to ensure they're working correctly. Pushing the TEST button should cut off the power, and pushing the RESET button should restore power.
If you're unsure about any aspect of running electricity outside your house, it's always best to consult a qualified electrician for advice or assistance. Safety should be the top priority in any electrical work.
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Aerial installations and potential hazards
When installing aerial electrical wiring outside your home, there are several potential hazards to be aware of and precautions to take. Firstly, it is essential to determine the burial depth of the wiring, as this is regulated by the National Electrical Code (NEC). Burial depths range from 4 to 24 inches, depending on the wiring method and the location of the buried wire. For example, rigid metal conduit (RMC) has a shallower burial depth of 6 inches, while underground feeder cable (UF) requires a depth of 12 inches.
Another critical aspect of aerial installations is ensuring proper grounding and protection against electrical hazards. All outdoor outlets, lighting fixtures, and bulbs should be weatherproof and protected by ground fault circuit interrupters (GFCIs). GFCIs automatically cut off the power when a plugged item comes into contact with water or experiences electrical leakage. Before drilling or digging, it is crucial to call 811 or check your state's website to locate buried electrical wires and avoid any potential hazards.
When working with electrical equipment or near power lines outdoors, always be mindful of weather conditions and potential safety risks. Operate equipment properly and follow safety instructions. Keep yourself and your equipment at least 10 feet away from power lines, as electricity can jump to nearby objects. Be cautious when using ladders, and keep them away from power lines. If you have a swimming pool, spa, or hot tub, have an electrician inspect and upgrade your electrical system to comply with local codes and the NEC.
Additionally, when running electrical wiring up the outside of your house and into the attic, there are a few considerations. You can use non-metallic sheathed cable (NM-B) from the electrical panel in the basement to a junction box, and then switch to UF-B cable outside, running it through EMT conduit up the house and into the attic. However, some sources suggest using THWN cable outside instead of UF-B. The gauge of the cable should typically be 12g. Make sure to limit pipe bends to 360 degrees, with 90-degree elbows at the entry and exit points, and use a heat gun to bend the conduit as needed.
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Connecting to an outdoor outlet
Connecting electricity to an outdoor outlet is a complex process that requires careful planning and execution to ensure safety and compliance with local regulations. Here is a step-by-step guide to help you understand the process:
Planning and Preparation:
Firstly, decide whether you want to install an aerial or underground wire. This decision will impact the specific steps and requirements of your project. Check with your local regulations and obtain the proper permits before starting any work.
Choosing the Right Cable:
The type of cable you choose will depend on your specific needs and installation method. UF-type cable is suitable for both indoor and outdoor use. It resembles NM (non-metallic sheath) cable but has a different construction. Direct burial cable, for example, requires a deep trench, typically at least 18 inches (45.7 cm) deep, and must be laid in the trench with smooth rocks on top to keep it in place.
Installing the Cable:
If you choose to install an underground cable, dig a trench at the appropriate depth, lay the cable, and ensure it is supported every 30-36 inches (76.2-91.4 cm). Secure the cable to wood if necessary, especially when running it over concrete. If there is a risk of physical damage to the cable, use Schedule 80 PVC pipe to protect it and terminate with proper pipe fittings.
Connecting to the Outdoor Outlet:
Fit the mounting box for the outdoor outlet, ensuring it is a weatherproof model with built-in GFCI (ground-fault circuit interrupter) protection. Draw in the wiring and connect it to the outlet terminals, then secure the faceplate, making sure all waterproof seals are correctly positioned.
Final Steps:
Run the wiring indoors to its connection point, adding a separate GFCI if none exists. Do not backfill the trench until an electrical inspector has checked your work. Ensure all exterior outlets have spring-loaded covers for protection against weather, pests, dirt, and moisture.
Remember, this is a complex process, and it is always recommended to consult with a licensed electrician, especially if you are unsure about any part of the procedure. Safety should be the top priority when working with electrical installations.
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Frequently asked questions
Decide whether you want to install an aerial or underground wire and then get the proper permits. For aerial installations, use a heat gun to bend 3/4" plastic conduit so you can go directly into the house without using a metal box. For underground installations, the National Electrical Code (NEC) sets the rules for burial depth, which ranges from 4 to 24 inches depending on the wiring method and location.
You can use UF (underground feeder) cable, which is suitable for both indoors and outdoors. Alternatively, you can use NM-B (non-metallic sheathed) cable, but this requires switching to UF-B for any outdoor portions of the wiring. Direct burial cable requires at least an 18-inch deep trench.
Always use a ground-fault circuit interrupter (GFCI) to ensure safety and comply with electrical codes. Use extension cords designed for outdoor use and do not leave them outside for extended periods to avoid sparking, fire, and shock hazards.
