A method of retaining a rack slide supported computer enclosure in a rack system having column flanges includes attaching a latch to the computer enclosure, sliding the computer enclosure into the rack system, and engaging a column flange with the latch as the computer enclosure is slid into the rack system. This control unit changes the uninterruptible power supply devices to be operated from one to another in a predetermined cycle such that the plurality of uninterruptible power supply devices are identical in operation time to one another. The tool includes a coupler configured to be coupled with the second end. By setting the reset time according to the above formula, an amount of acceleration imposed on the capacitor member is accurately detected even when the capacitor member has a certain level of the initial capacitance. According to said method, a partial or all-over layer reflecting electromagnetic waves is applied to a carrier substrate, followed by at least one partial andor all-over polymer layer having a defined thickness, and a layer consisting of metallic clusters which is produced by means of a method using vacuum technology or from systems based on solvents is then applied to said spacer layer.