Regulations Electrical Equipment Regulation

The most important testing protocol for resistance to deterioration of critical physical properties upon exposure to heat, especially over prolonged periods of time, was designed by the Underwriters Laboratories (UL) [1], The UL temperature index is used to qualify materials for applications (such as use in electrical equipment) regulated by UL. The main purpose of these tests is to ensure that a polymer can be used safely for a prolonged period of time in these applications. A larger value of the UL temperature index implies greater stability, defined in... 

Inspection Certificate - Based on requirements to comply with the lEE Regulations for the Electrical Equipment of Buildings... 

Chaper 6, "Electrical Equipment and Wiring", AMC Regulation 385-100, U.S. Army Materiel Command, 1984... 

For the control/monitoring instrumentation, regulating devices, and any associated electrical equipment, predelivery testing and calibration is normally the responsibility of the instrument/equipment manufacturer and should be carried out to approved written procedures using calibration test equipment that is traceable back to agreed-upon national standards. The test equipment must have precision, accuracy, and repeatability that are higher than that of the instrument being calibrated. 

PCBs Polychlorinated biphenyls are a group of toxic chemicals used for a variety of purposes and found in a number of products, such as carbonless copy paper, adhesives, hydraulic fluids, and caulking compounds. They were originally used to insulate electrical equipment, and although they ve been banned in the United States since the late seventies, they are still found in water. They accumulate in the sediment at the bottoms of rivers and lakes, and build up in the fatty tissues offish. The primary effect of PCBs is on the endocrine system, which is responsible for regulating the hormones in our bodies. They are particularly dangerous to fetuses and young children. If PCBs get into your bloodstream, they can upset the body s natural hormone levels and can lead to birth defects and cancers. 

Substation Facility equipment that switches, changes or regulates electric voltage. 

TGL Technische Gute- und Lieferbedingungen, Technical Regulations for Quality and Delivery) have defined the classification of hazardous areas (TGL 30042) and the requirements for construction and testing of explosion protected electrical equipment (mainly TGL 19491). 

Although the flash point of a residue sample may be high, it is almost certain (because it will, on initial discharge, be near its boiling point), that the contents of the residue tank will be above its flash point and electrical equipment, bunding and regulations in the area surrounding the tank should be as for a low flash point product. 

For these reasons the Mock-Up was provided with two complete shim-safety rod channels and one regulating rod channel. The control, room contained the operating console which served as the study model for the MTR desk and a relay panel, both equipped with the necessary electrical equipment for testing system performance. 

Adiabatic calorimeters have only become possible with advanced designs for electrical temperature measurement and the availability of regulated electrical heating. The first adiabatic calorimeter of this type was described by Nemst in 1911 [9]. Special equipment is needed for low-temperature calorimetry, below about 10 K as are described in Sect. 4.3. Modem calorimeters [10-13] are more automated than the adiabatic calorimeter shown in Fig. 4.33, but the principle has not changed from the original design by Nemst. 

A quarter of all serious electrical accidents involve portable electrical appliances that is, equipment which has a cable lead and plug and which is normally moved around or can easily be moved from place to place. This includes, for example, floor cleaners, kettles, heaters, portable power tools, fans, televisions, desk lamps, photocopiers, fax machines and desktop computers. There is a requirement under the Health and Safety at Work Act for employers to take adequate steps to protect users of portable appliances from the hazards of electric shock and fire. The responsibility for safety applies equally to small as well as large companies. The Electricity at Work Regulations 1989 also place a duty of care upon employers to ensure that the risks associated with the use of electrical equipment are controlled. 

The Electricity at Work Regulations tell us that we must ensure the disconnection and separation of electrical equipment from every source of supply and the separation must be secure . A procedure to comply with this regulation is called... 

Where earthed electrical equipment may come into contact with the metalwork of other services, they too must be effectively connected to the main protective earthing terminal of the installation (lET Regulations Chapter 544). 

Part 5 of the lET Regulations tells us that electrical equipment and materials must be chosen so that they are suitable for the installed conditions, taking into account temperature, the presence of water, comosion, mechanical damage, vibration or exposure to solar radiation. Therefore, PVC insulated and sheathed cables are suitable for domestic installations but, for a cable requiring mechanical protection and suitable for burying underground, a PVC/ SWA cable would be preferable. These two types of cable are shown in Figs 3.38 and 3.39. 

Appendix 5 of the IET Regulations also identifies the required IP classification to prevent dust or objects from penetrating electrical equipment as follows ... 

The electrical contractor is charged with a responsibility to carry out a number of tests on an electrical installation and electrical equipment. The individual tests are dealt with in Part 6 of the lET Regulations and described later in this chapter. 

---