A power strip also known as an extension blockpower boardpower barLoad switching power strip boardtrailing gangtrailing socketplug bartrailer leadmulti-socketmulti-boxmultiple socketmultiple outletpolysocket and by many other variations is a block of electrical sockets that attaches to the end of a flexible cable typically with a mains plug on the other endallowing multiple electrical devices to be powered from a single electrical socket.
Power strips are often used when many electrical devices are in proximity, such as for audiovideocomputer Load switching power strip, appliances, power toolsand lighting. Power strips often include a circuit breaker to interrupt the electric current in case of an overload or a short circuit.
Some power strips provide protection against electrical power surges. Typical housing styles may include strip, rack-mountunder-monitor and direct plug-in.
Some power strips include a master switch to turn all devices on and off. This can be used with simple devices, such as lights, but not with most computers, which must use shutdown commands from the software.
Computers may have open files, which may be damaged if the power is simply turned off. Remote control strips are used in data centersto allow computer systems or other devices to be remotely restarted, often over the Internet although this leaves them vulnerable to outside attacks. Many power strips have a neon or LED indicator light or one per output socket to show when power is on. Better-quality surge-protected strips have additional lights to indicate the status of the surge protection system, however these are not always reliable as an indicator.
Some power strips have
Load switching power strip features, Load switching power strip switch off the strip if appliances go into standby mode. Using a Load switching power strip circuit, they detect if the level of power through the socket is in standby mode less than 30 wattsand if so they will turn off that socket.
However, there can be problems detecting standby power in appliances that use more power in standby mode such as plasma televisions as they will always appear to the power strip to be switched on. When using a master—slave power strip, one way to avoid such problems is to plug an appliance with a lower standby wattage such as a DVD player into the master socket, using it as the master control instead.
A different power strip design intended to save energy uses a passive infrared PIR or ultrasonic sound detector to determine if a person is nearby. If the sensors don't detect any motion for a preset period of time, the strip shuts off several outlets, while leaving one outlet on for devices that should not be powered off.
These so-called "Load switching power strip" power strips" are intended to be installed in offices, to shut down equipment when the office is unoccupied. It is recommended that appliances that need a controlled shutdown sequence such as many ink-jet printers not be plugged into a slave socket on such a strip as it can damage them if they are switched off incorrectly for example the inkjet printer may not have capped the print head in time, and consequently the ink will dry and clog the print head.
In some countries where multiple socket types are in use, a single power strip can have two or more kinds of socket. Socket arrangement varies considerably, but for physical access reasons there are rarely more than two rows. In Europe, power strips without surge suppression are normally single row, but models with surge suppression are supplied both in single and double row configurations.
If sockets on a power strip are grouped closely together, a cable with a large " wall wart " transformer at its end may cover up multiple sockets. Various designs address this problem, some by simply increasing the spacing between outlets. Other designs include receptacles which rotate in their housing, or Load switching power strip short receptacle cords feeding from a central hub.
A simple DIY method for adapting problematic power strips arrangements to large "wall warts" is to use a three-way socket adapter to extend the socket above its neighbors, providing the required clearance.
Some also provide surge suppression for phone lines, TV cable coax, or network cable.
Unprotected power strips are often mistakenly called "surge suppressors" or "surge protectors" even though they may have no ability to suppress surges. Surge suppression is usually provided by one or more metal-oxide varistors MOVswhich are Load switching power strip two-terminal semiconductors. These act as very high speed switches, momentarily limiting the peak voltage across their terminals.
By design, MOV surge limiters are selected to trigger at a "Load switching power strip" somewhat above the local mains supply voltage, so that they do not clip normal voltage peaks, but clip abnormal higher voltages. It should be borne in mind that this voltage specification is RMSnot peak, and also that it is only a nominal approximate value. Mains electrical power circuits are generally grounded earthed "Load switching power strip," so there will be a live hot wire, a neutral wire, and a ground wire.
Low-cost power strips often come with only one MOV mounted between the live and neutral wires. More complete and desirable power strips will have three MOVs, connected between each possible pair of wires. Since MOVs degrade somewhat each time they are triggered, power strips using them have a limited, and unpredictable, protective life. Some power strips have "protection status" lights which are designed to turn off if protective MOVs connected to the live wire have failed, but such simple circuits cannot detect all failure modes such as failure of a MOV connected between neutral and ground.
The surge-induced triggering of MOVs can cause damage to an upstream device, such as an uninterruptible power supply UPSwhich typically sees an overload condition while the surge is being suppressed. Therefore, it is recommended not to connect a surge-protected power strip to a UPS,  but instead to rely solely on surge protection provided by the UPS itself.
More-elaborate power strips may use inductor-capacitor networks to achieve a similar effect of protecting equipment from high voltage spikes on the mains circuit. These more-expensive arrangements are much less prone to silent degradation than MOVs, and often have monitoring lights that indicate whether the protective circuitry is still connected.
The standard covers both the performance of the surge suppression circuit and their safety. Likewise, power strips with telecoms surge suppression circuits can demonstrate compliance with the LVD by complying with the requirements of EN Connecting MOV-protected power strips in a "daisy chain" in a series, with each power strip plugged into a previous one in the chain does not necessarily increase the protection they provide.
However, due to manufacturing variations between the MOVs, the surge energy will not be spread evenly, and will typically go through the one that triggers first. Daisy chaining of power strips known in building and electric codes as multi-plug adapters or relocatable power tapswhether surge protected or not, is specifically against Load switching power strip codes.
Where the current rating of the socket outlet, plug and lead of "Load switching power strip" power strip is equal to the rating of the circuit breaker supplying the circuit concerned, additional overload protection for the power strip is unnecessary, since the existing circuit breaker will provide the required protection. However, where the rating of a socket outlet and, hence, the plug and lead of the power strip is less than the rating of the circuit breaker supplying the circuit concerned, overload protection for the power strip and its supply cable is necessary.
In the UK, standard BS plugs and sockets are rated at A but are provided on circuits protected by circuit breakers of up to 32 A. Hence, in the UK and in other
Load switching power strip using BS plugsthis fused plug provides overload protection for any power strip.
The fuse must be replaced if the power strip is overloaded, causing the fuse to operate. In Australia and New Zealand the rating for a standard socket outlet is 10 Amperes but these outlets are provided on circuits protected by circuit breakers of up to 20 A. These power strips have a reset button for the circuit breaker, which is used to return the strip to service after an overload has caused it to trip.
Electrical overloading can be a problem with any sort of power distribution adapter. This is especially likely if multiple high-power appliances are used, such as those with heating elements, like room heaters or electric frying pans. Power strips may have a circuit breaker integrated to prevent overload. In the UK, power strips are required to be protected by the fuse in the BS plug. Some also feature a 13A BS fuse in the socket end.
These low-cost adapters are generally not fused although more modern ones in the UK and Ireland are. Therefore, in many cases the only protection against overload
Load switching power strip the branch circuit fuse which may well have a rating higher than the adapter.
The weight of the plugs pulling on the adapter and often pulling it part way out of the socket can also be a problem if adapters are stacked or if they are used with brick-style power supplies. Such adapters, while still available, have largely fallen out of use Load switching power strip some countries although two- and three-way adapters are still common in the US, UK, and Ireland.
When plugging a device into a power strip, a buildup of carbon or dust can cause sparking to occur. A relocatable power tap is intended only for indoor use as a temporary extension of a grounding alternating-current branch circuit for general use.
Load switching power strip Regulations S. The regulation requires all socket Load switching power strip units to comply with the requirements of BS Specification for 13A switched and unswitched socket-outlets and with the requirements of BS Specification for General requirements for electrical accessories.
Sockets and socket outlets do not require independent approval under the regulations. Any plug fitted to the socket outlet unit must comply with the requirements of BS Specification for rewirable and non-rewirable 13A fused plugs. Plugs must also be independently approved and marked in accordance with the requirements of the regulation.
Examples of power strips exist in the U. Perhaps the first modern designs for the power strip were created by the U. One early iteration, called a "power board", was invented in by Australian electrical engineer Peter Talbot working under Frank Bannigan, Managing Director of Australian company Kambrook. The product was hugely successful, however, it was not patented and market share was eventually lost to other manufacturers. Media related to power strips at Wikimedia Commons. From Wikipedia, the free encyclopedia.
Helping to Stop Idle Current Now! Retrieved 14 June Verde Energy Efficiency Experts. Verde Sustainable Solutions, L3C.
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