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Selecting the right outdoor electrical wire to run from the utility pole to your home is a common concern during home repairs or construction. In this article, join Mytour as we explore the best practices for choosing the most suitable electrical wire for this purpose today!
I. Key considerations when selecting outdoor electrical wires or wires running from the pole to your house
The electrical wire used to connect from the utility pole to your home is often referred to as 'outdoor electrical wire.' This name stems from the fact that these wires are exposed to the elements, enduring harsh conditions like sun, rain, and humidity. Outdoor wires are designed to higher standards than indoor residential wires to ensure durability and the ability to withstand extreme weather conditions.
1. Prioritize selecting electrical wires with XLPE insulation
Outdoor electrical wires nowadays predominantly use XLPE sheathing instead of PVC or PE plastic. XLPE is a highly durable protective coating that can withstand direct sunlight, rain, and environmental corrosion. In contrast, indoor wires typically use PVC sheathing, which is softer but lacks the resilience to endure harsh weather conditions. Therefore, indoor wires should not be used for running from the utility pole to your home. Additionally, indoor wires often have smaller cross-sections, which can lead to overheating and explosions in cases of overloading.
2. Prioritize selecting seamless electrical wires
When choosing wires to run from the pole to your house, opt for a seamless wire rather than a spliced or patched one. Manual splicing often compromises quality and safety during use. Seamless wires offer better load-bearing capacity and durability in extreme weather. Most electrical short circuits and fires originate from poorly executed or unsafe splices.
3. Calculate the length of the electrical wire
Most electrical wire manufacturers currently test and certify wires at a standard length of 30 meters. If the distance from the utility pole to your home exceeds 30 meters, you should consult with technical experts from the power company or suppliers for the best advice and support. In practice, longer electrical lines experience greater power loss, so increasing the wire size is necessary to ensure stable performance.
II. How to choose the correct type of electrical wire to run from the pole to your house
In Vietnam, popular electrical wire brands include Cadivi (Southern region), Trần Phú (Northern region), Cadisun (Northern region), Goldcup, Vinakip, and Thịnh Phát. Depending on your region, you can select a suitable brand.
1. How to choose the type of wire to run from the pole to your house
In Vietnam, the CXV wire code is the most common and widely chosen for running electrical wires from the pole to homes. The CXV wire is constructed with the following components:
- The letter C (CU): Stands for copper (CU), indicating that the wire is made of pure copper, which offers excellent electrical conductivity.
- The letter X (XLPE): Represents XLPE, or Cross-linked polyethylene, a highly durable and reliable insulation material suitable for all conditions. The letter V (PVC): Denotes PVC, referring to the outer protective sheath made of durable PVC plastic.
CXV wires offer several advantages, including excellent conductivity, high heat resistance, flame retardancy, and durability, making them ideal for running from utility poles to households. Additionally, CXV wires are commonly used in hospitals, apartment buildings, schools, hydropower projects, and industrial zones, demonstrating their reliability and safety.
In Vietnam, CXV wires come in various configurations, including single-core, two-core, three-core, four-core, three-phase CXV, and three-core CXV with grounding. The choice depends on the specific application. For residential and household electrical systems, a two-core CXV wire is typically the best option.
2. Which sections of the utility pole wiring can users replace?
Many people are unfamiliar with the terms of their electricity contracts and the structure of utility poles provided by EVN. On a utility pole, the electrical cabinet distributes power to individual households, each equipped with a separate meter to track electricity usage. The electrical setup is as follows:
- EVN's main power line ➔ Divides into households via the pole ➔ Each household has its own meter ➔ Main circuit breaker (CB) (1P type – cuts the live wire) ➔ Connects from the pole's circuit breaker to the household's circuit breaker.
Most utility poles today use a 1P circuit breaker (CB) that cuts the live wire, while the neutral wire is shared among different households through a copper rod.
According to electricity contracts, EVN is responsible for managing the wiring from the main power line to the meter. This means the section from the meter to the customer's home falls under the customer's responsibility. Therefore, you are only permitted to replace the wiring after the main circuit breaker on the pole. Any issues before the circuit breaker require contacting EVN for assistance.
Thus, the electrical wire used to connect from the utility pole to your home is the section from the pole's circuit breaker to your house. Simply put, everything before the meter belongs to EVN, and everything after belongs to the customer.
3. How to choose the cross-section of the wire running from the utility pole to your house
In addition to selecting high-quality wires, you must also consider the wire's cross-section, as this determines its load-bearing capacity for your devices. However, each household has different electricity consumption levels at any given time, making it challenging to provide precise advice on the ideal wire cross-section for running from the utility pole to your home.
In this case, you need to research and choose the appropriate wire yourself. Selecting a wire that's too small can be dangerous, while choosing one that's too large can be wasteful due to the high cost of outdoor electrical wires. Below is a guide to help you select the right wire for your home:
Use the same wire gauge as the power company
As previously mentioned, you can only replace the wiring after the pole's circuit breaker. This means you can refer to the wire gauge used by EVN before the circuit breaker. Visit the utility pole and check the wire size EVN uses to connect to the circuit breaker and meter. Then, choose a wire of the same size to run from the pole to your home.
Choosing a wire gauge that matches the power company's specifications is the best and most suitable solution for all households, ensuring consistency. Currently, most residential power providers use paired wires with a single core diameter of 6 mm2.
Using a wire gauge larger than the power company's
Opting for a wire gauge larger than the power company's is a more expensive but safer approach. In this scenario, you can rest assured that if an overload occurs, the issue will lie with the power company's wiring, not yours. Simply put, if your wire can handle 50A but the power company provides a wire rated for 40A, consuming around 45A will cause the power company's wire to fail, leaving your section from the pole to your home unaffected.
In this article, Mytour has shared the best practices for selecting the right wire to run from the utility pole to your home. Wishing you a great day!
