Equipment protection level

C dust, carbon dust (e.g., coal dust) EPL, equipment protection level. 

Cat, category EPL, equipment protection level Prot, protection. ... 

B ID. NO. OF NOTIFIED BODY CERTIFYING AUTHORITY BY QA/PRODUCT TEST 8 EQUIPMENT PROTECTION LEVEL Gb/Ob FOR CAS OUST (Cot 2G/20-EN ]... 

BIL of the equipment Impulse protection level of the arrester (Vres)... 

The protection level of the arrester diminishes with the steepness of the wave. As / falls, of the arrester rises, leaving a smaller protection margin across the protected equipment. Refer to the characteristics of an arrester as shown in Figure 18.7, for a 10 kA, 8/20 /is impulse wave. For a front time of, say, 0.5, tis, it will have a of approximately 118% of its rated at 8 /is, and hence will reduce the protection margin as in equation (18.2). 

Whether its protective level can protect the BIL of the system and/or the equipment it is protecting, and... 

Increasing the TOV level, i.e. choosing a higher protective level (V,es) of the arrester, may increase the life of the arrester but will reduce the margin of protection for the protected equipment. Selection therefore should be done judiciously bearing all these aspects in mind. 

The criteria to determine the safe protective level of an arrester are the BIL of the equipment, as shown in Table 11.6 for motors. Tables 13.2 or 14.1 for switchgears, Table 32.1(A) for bus systems, and Tables 13.2 and 13.3 for all other systems. Motors have a comparatively lower BIL, but they are not connected directly on an outdoor... 

The protective level as determined above is true only when the surge arrester is mounted directly on the protected equipment (Figure 18.21), But this is seldom possible, us there is usually a gup between the surge arrester and the equipment, due to arrester height, connecting leads... 

We should keep in mind that the main difference between level D and C equipment is the amount of respiratory protection. Level C protection requires use of a respiratory device (APR). Requiring workers to work in level C for more than a small percentage of the time can prove to be a challenging situation for both workers and managers. Respirators, especially full-face respirators, can provide excellent protection for workers, but are also found to be a source for worker complaints. 

All input parameters, scenario definitions and results are stored in a database for easy access and retrieval. Analysis of individual scenario results and statistical analysis over all scenarios (or any subset) is possible. Typical individual scenario results are deposition, dosage and casualty level on the attacked target. Typical statistical analysis results are dosage and deposition threat spectra, and casualty spectra. The casualty levels and spectra can be obtained for various health effect levels (eye effect, incapacitation, lethal) and protection levels (no protection, suit only, mask only, mask and suit, collective protection). This model thus largely eliminates the subjectivity involved in scenario studies, protective and detector equipment procurement. 

Personal Protective Equipment At all times wear protective Level A until you know what you are dealing with upon learning the exact type of infectious material(s) you are dealing with, consult proper toxicological levels and downgrade as necessary for safety and comfort of operation. 

Note For proper protection, the impulse level of all protected equipment must be greater than the front of wave protective level by a margin of 25% or greater. 

Nevertheless, due to increase of threats from different terrorist groups, works must be continued on further upgrading of the actual physical protection level at PA Mayak s transport facilities. First and foremost, this implies prompt equipment of the special train of TK-VG-18 railcars and the TK-VS escort-car with up-to-date systems of physical protection and communications. 

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