Monday, September 26, 2011

Under Cabinet Lighting

By Tina Edwards


Under cabinet lighting illuminates the work area below with fixture installed on the underside of the cabinet. Ideally, the fixture(s) used in under cabinet lighting should minimize their physical presence and conceal physical wiring as much as possible. While this form of lighting is technically geared toward practical activity, it is important to maintain aesthetic harmony with the surrounding environment and also produce the right type of illumination over the work area. Counter tops and food preparation need an evenly distributed field of linear lighting rather than hot spots of light that appear brighter than the rest of the work area. This light should blend comfortably with the general lighting of the room without producing discomforting glare.

Charger : in a number of UPS systems due to the nature of their design a separate battery charger is used, this is more common on sub 60kVA UPS systems and is very common on small sub 3kVA units.

A typical example of a situation when there is a need to remove power to equipment in an emergency situation is in the case of fire. An un-interruptible power supply by its very name means that when the building is isolated it will continue to provide an output until the batteries are exhausted. The continued supply of power in these situations can lead to additional fires as cables are damaged by the original cause. The EPO in this situation is often connected to the fire alarm panel and will operate on the second and subsequent detection of fire within a defined area.

Inverter : this section of the Uninterruptible power supply provides an ac output to the load which is in phase with the input mains supply. Due to the number of conversions (ac to dc to ac) and the filtering involved it can be termed as a 'clean supply'.

In effect, your un-interruptible power supplies suddenly are no longer uninterruptible once the EPO has been activated.

You must be very careful where the EPO is positioned, to avoid accidental or malicious use. Certainly each EPO needs to be monitored and covered y CCTV at the very least.




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