Is It Safe to Daisy Chain Power Strips and Extension Cords?
For many homeowners and professionals, running out of power outlets can be a common challenge. Instead of sacrificing plug points, it may seem like a logical solution to daisy chain power strips and extension cords. However, this practice is generally not recommended due to multiple safety concerns.
The Risks of Daisy Chaining
Overloading: Each power strip and extension cord has a maximum load capacity. When many devices are connected together, the cumulative load can exceed the rating of the individual components, leading to overloading. This can cause dangerous overheating and increase the risk of electrical fires.
Voltage Drop: Long chains of extension cords can introduce a phenomenon known as voltage drop. This occurs when voltage levels are decreased over long distances, often affecting the performance of connected devices. It can also contribute to malfunctions or damage to sensitive electronic equipment.
Tripping Hazards: The increased number of cords and strips can result in a cluttered workspace, raising the risk of tripping accidents and causing damage to the cords themselves.
Fire Hazard: With multiple connections and devices plugged in, especially if the cords are not rated for the total load, the risk of fire significantly increases. This is particularly dangerous if the cords are in use for extended periods or in exposed environments.
Alternative Solutions
Instead of daisy chaining, it is generally safer to use a single high-quality power strip with overcurrent protection and ensure it is plugged directly into a wall outlet. For situations where additional outlets are needed, professional solutions such as having a qualified electrician install additional outlets in the space are recommended.
Understanding Load Capacities
Extension cords are specifically rated for a certain load, which is usually specified in amps (e.g., 5, 10, or 15 amps) under controlled conditions (such as open air). Extension cords lack built-in safety features, and if overloaded, they can melt, creating a fire hazard. Similarly, power strips (often referred to as power taps) are not designed to be connected in series. Some power strips have fuses or thermal reset switches, but not all do. These components work differently: 'Slow-Blow' fuses require a significant overload over a period of time before they trigger, while 'PPTC' (Polymeric Positive Temperature Coefficient) devices can trip at very high loads or surges.
When multiple power strips are daisy chained, the cooling properties are impaired. This can lead to the housing of the power strip becoming warm and eventually overheating.
Safety Standards
In the United States, the Occupational Safety and Health Administration (OSHA), the National Fire Protection Association (NFPA), and Underwriters Laboratories (UL) set the standards for electrical safety. OSHA references UL certification, which explicitly requires relocatable power taps to be directly connected to a permanently installed branch circuit. This means they should not be plugged into another power strip.
For more detailed information on these standards and the associated risks, you may refer to the provided documents and additional resources.
Daisy chaining power strips and extension cords may seem like a quick fix, but it can potentially lead to significant safety issues. Always prioritize safety by using high-quality, single power strips and, if necessary, consult a professional to add additional outlets.