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Motors have very little room for electrical insulation so they generally have low voltage ratings. Because transformers (prior to the development of power electronics) cannot step down DC voltages, trains were supplied with a relatively low DC voltage that the motors can use directly. The most common DC voltages are listed in the previous section. Third (and fourth) rail systems almost always use voltages below 1 kV for safety reasons while overhead wires usually use higher voltages for efficiency. ("Low" voltage is relative; even 600 V can be instantly lethal when touched.)

Why do motors have little space for insulation?
Answer: low voltage ratings
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Egypt has hosted several international competitions. the last one was 2009 FIFA U-20 World Cup which took place between 24 September - 16 October 2009. On Friday 19 September of the year 2014, Guinness World Records has announced that Egyptian scuba diver Ahmed Gabr is the new title holder for deepest salt water scuba dive, at 332.35 metres. Ahmed set a new world record Friday when he reached a depth of more than 1,000 feet. The 14-hour feat took Gabr 1,066 feet down into the abyss near the Egyptian town of Dahab in ther Red Sea, where he works as a diving instructor.

What was the last international competition Egypt hosted?
Answer: 2009 FIFA U-20 World Cup
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Other supportive evidence includes: a ≥20% difference in peak expiratory flow rate on at least three days in a week for at least two weeks, a ≥20% improvement of peak flow following treatment with either salbutamol, inhaled corticosteroids or prednisone, or a ≥20% decrease in peak flow following exposure to a trigger. Testing peak expiratory flow is more variable than spirometry, however, and thus not recommended for routine diagnosis. It may be useful for daily self-monitoring in those with moderate to severe disease and for checking the effectiveness of new medications. It may also be helpful in guiding treatment in those with acute exacerbations.

What is more variable than spirometry but not recommended?
Answer:
. Testing peak expiratory flow