1978-02 February IBEW Journal.pdf - International Brotherhood of ...
1978-02 February IBEW Journal.pdf - International Brotherhood of ...
1978-02 February IBEW Journal.pdf - International Brotherhood of ...
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W<br />
ITMAYBE<br />
COLDER THAN<br />
YOUTHINK!<br />
e aU know that when the thermometer registers, or a higher wind velocity acts to increase the danger<br />
say 30° F, it sometimes seems a 101 colder <strong>of</strong> frostbite.<br />
than on other days. Of course, the difference in "Th e combined effect <strong>of</strong> wind and temperature<br />
feeling is due to the amount <strong>of</strong> wind thai is blowing is expressed in the Wind-Chili Chart as an eQuivaat<br />
the lime. The below Wind-Chili Chart will help lenllemperature, which is the effective temperature<br />
us to determine the protection we should use under acting on exposed flesh . II Is emphasized that the<br />
various conditions.<br />
Wind-Chill Chart is <strong>of</strong> value in predicting frostbite<br />
The Wind-Chi ll Chart was originally brought oul only to exposed flesh .<br />
by the U. S. Army's Cold Weather Laboratories and , "Any clothing or material which stops or reduces<br />
during the past 10 years, has been modified in line the wind will give a degree <strong>of</strong> protection (from frostwith<br />
the experiences <strong>of</strong> civilians and military men bite) .. .. No attempt should be made to estimate<br />
who have participated in the National Science this protection in the use <strong>of</strong> the Wind-Chill Chart.<br />
Foundation's U.S. Antarctic Research Program. Wet clothi ng or boots have a much reduced insu-<br />
As one NSF reporl explains, "The human body lating value and will result in heat loss nearly that<br />
is continually producing and losi ng heat. Wind in- <strong>of</strong> exposed flesh ."<br />
creases the loss <strong>of</strong> heal by dispersing the layers <strong>of</strong> In brief, it can be said , according to Army experts,<br />
air between layers <strong>of</strong> clolhing next to the skin. that the Wind-Chill Chart equivalent temperature Is<br />
"'n low temperatures, with a wind that removes the temperature exposed flesh would experience if<br />
the heat faster than the body can replace it, frost- one were standing in a deep freezer and no wind<br />
bite occurs. Thus, a lowering allhe air temperature was blowing.<br />
- 15--2-0 25 30 35 -40 -45<br />
WIND<br />
,.<br />
WIND CHI LL CHART<br />
MPH<br />
(EQU IVALENT lEMPERATURE)- EqUivalent In cooling power on eKposed flesh under calm condi tionS<br />
CALM 35 30 25 20 15 10 5 0 - 5 - 10 - 15 - 20 - 25 -30 -35 -40 -45<br />
5 33 27 21 16 12 7 1 -6 -ll - 15 -20 - 26 -31 - 35 - 41 -47 -54<br />
VERY COlD<br />
10 21 16 9 2 - 2 - 9 -15 -22 - 27 -31 -38 - 45 - 52 - 58 - 64 -70 -77<br />
15 16 II 1 - 6 - 11 - 18 - 25 -33 - 40 -45 -51 -60 -65 - 70 -78 - 85 -90<br />
BITIERLY CO LD<br />
20 12 3 -4 - 9 - 17 - 24 -32 - 40 -46 - 52 -60 -68 - 76 -81 -88 - 96 - 103<br />
25 7 0 -7 - 15 - 22 - 29 -37<br />
-45 - 52 - 58 -67 - 75 -83 - 89 -96 - 104 - 11 2<br />
EXTREME<br />
30 5 -2 -ll -18 - 26 - 33 - 41 - 49 -56 -63 -70 -78 - 87 -94 -101 - 109 -117<br />
COLO<br />
35 3 - 4 - 13 -20 - 27 -35 - 43 - 52 -60 -67 -72 -83 -90 - 98 -105 - 113 -123<br />
40 1 - 4 -15 -22 -29 - 36 - 45 - 54 - 62<br />
EX POSED FLESH FREEZES<br />
- 69 -76 -87 -94 - 10 1 -107 - 116 - 128<br />
45 1 -6 - 17 -24 - 31 -38 - 46 -54 - 63 - 70 - 78 -87 - 94 - 101 - 108 - 118 - 128<br />
50 0 -7 - 17 -24 - 31 -38 - 47 -56 -63 -70 -79 -88 - 96 - 103 - 11 0 - 120 - 128<br />
AN ISEW MONTHLY SAFETY MESSAGE
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