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Hardwire Power
July 18th, 2010 Posted 7:49 pm
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Hardwire Power
Uninterruptible Power Supply - Automatic And Static Transfer Switches
Automatic Transfer Switches (ATS) are designed to provide resilience in power continuity planning and uninterruptible power supply (UPS) implementations below 10kVA, where UPS cannot be operated in parallel.
Static Transfer Switches are relay-based and can be used in place of PDUs (Power Distribution Units) for plug-and-play loads. Care has to be taken with such devices to ensure a single-point-of-failure is not introduced on the output side of the uninterruptible power supply. Each device is fused or protected by a circuit-breaker and should it open or rupture the load could potentially be dropped.
Automatic Transfer Switches contain two ac input power sources (A) and (B). One possible mode of operation is that Power source (A) can be supplied from the output of a UPS and (B) from a mains power supply. Another is that both (A) and (B) are supplied from two separate uninterruptible power supply outputs. Another alternative is that both are supplied from two separate mains power supplies.
When one of the power supplies fails, the load/s are automatically transferred to the second. When the two supplies are in phase with one another, the transfer is instantaneous.
In addition, an Automatic Transfer Switch can provide protection against load short—circuits, the ability to switch its output power connections on and off remotely (over a network) and load measurement locally via an LCD or built-in sub-D type communications port. ATS can also be hardwired for higher operating power.
This article was compiled using information available in The Power Protection Guide – the design, installation and operation of uninterruptible power supplies (ISBN: 9 780955 442803). By Robin Koffler and Jason Yates of Riello UPS.
About the Author
Robin Koffler is the General Manager for Riello UPS Ltd the UK subsidiary of Riello UPS (RPS S.p.A) a leading European manufacturer of Uninterruptible Power Supplies and a co-author of The Power Protection Guide(ISBN 978-0-9554428-0-3)- available from Amazon.com
Can I convert a plug in to a hardwire?
I bought a light fixutre online and I did not know it had an AC power cord. I want to mount it in my bathroom, but I want to be able to turn it on with the light switch, not the inline switch on the power cord. Is this possible? Is there a kit of some sort? Or can I convert it to a hardwire?
O please help!
You are better and safer to install a 15 amp GFCI and plug it in to that. It can still be connected to a switch and a GFCI will trip in a fraction of a second if it detects the slightest fault and saves folks from getting a nasty, possibly lethal shock. Use 12/2 wire and you can buy a blue plastic box called a "J" box from any hardware store or Home Depot that has screws in it that turn lugs to lock behind the drywall. Draw an outline around the box and cut a hole with a drywall saw. It is pretty easy. Then connect the wire to the GFCI. Wiring depends on if the power goes to the light switch or to the receptacle (or light unit if you do not use a GFCI).
If the power goes to the light unit or receptacle first, you will have a "hot" white wire. The hot white is wrapped for an inch with black electrical tape to show this. If the power goes to the switch first, you connect the 2 neutral whites together and the two hots (black) connected to the switch.Then the black and white are connected to the light unit or the GFCI receptacle, depending on which way you decide to do it. MAKE SURE THE CORRECT BREAKER IS OFF before you do anything and double check with a circuit tester that the power is off at the wiring you are working on.
G37 Radar Detector Hardwire - with switched power source