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robertotugalanp1wlgs
22.02.2020 •
Physics
Several 4-conductor cables are installed in a ladder cable tray without a cover and without exceeding the cable tray fill limit. Each 4-conductor cable comprises four 1/0 AWG THHN copper conductors, each of which is considered current-carrying. What is the allowable ampacity of each 1/0 AWG THHN copper conductor?
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Ответ:
The allowable ampacity is 136 amperes
Explanation:According to the National Electrical Code the ampacity for insulated conductors of type 1/0 AWG THHN is 170 amperes(from tables) for cables no exceeding 3
But we are presented with 4 cables in a tray,
Going by the National Electrical Code where conductors exceeds 3, the allowable ampacity shall be reduced to 80% the of the ampacity gotten from table.
Hence the allowable ampacity for 4 copper cables of type 1/0 AWG THHN is (80/100) *170=136 Amperes
Ответ:
d and e
Step-by-step explanation:
Use the quadratic formula to solve for this.
x^2 + 3x + 5
1 = a
3 = b
5 = c
-3 +-![\sqrt{3^2 - 4(1)(5)}](/tpl/images/0916/2957/7c418.png)
2(1)
3^2 - 4(1)(5) = --11
sqrt of -11 could be reduced to![i\sqrt{11}](/tpl/images/0916/2957/34225.png)
so your answer would be: