1. What is the CAT rating system in Voltage measurements and give two examples e
ID: 1454742 • Letter: 1
Question
1. What is the CAT rating system in Voltage measurements and give two examples each of CAT I, II, III, and IV locations.
2. What is the Voltage of the electrical system of a typical automobile? Is there a substantial risk of electrocution if you touch the terminals of the batteries with your fingers? Is there any concern that if while removing the positive battery terminal, you unintentionally touch the other end of the wrench to the vehicle body; how much current can a typical car battery source? Is it enough to melt a wrench?
3. You are required to put safety labels on a machine that your company is designing. Can you use your own color scheme to be aesthetically pleasing to the marketing people, such as pink danger labels, and make up your own non-standard symbols?
4. Why would it be preferable to use an infrared camera or IR thermometer to look for hot electrical or process equipment than finding hot spots by touching them with hands or probes?
5. What does OSHA say (look this up on OSHA’s website and cite) about who can apply a lock & tag in lock out tag out? Who can remove the tag & lock? Can a co-worker remove it? Can your supervisor overrule your lock out tag out and remove both over your objections?
Explanation / Answer
Solving first question
Answer 1.
CAT rating system in voltage measurement is a system to rate test instruments on their ability to resist a voltage spike, which is applied through a specific resistance. The higher the category, the more risk there that a high voltage can overload a circuit and cause electrical and physical damage. Usually, the higher the CAT (category) rating, the safer the rating.
Examples of
CAT I -limited-energy parts of equipment, circuits powered by regulated low-voltage sources
CAT II- local-level electrical distribution,measurements performed on household appliances, portable tools, and similar modules.
CAT III-measurements on hard-wired equipment in fixed installations, distribution boards, and circuit breakers
CAT IV - origin of installation or utility level measurements on primary over-current protection devices and on ripple control units.
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