00:01
Hello students, a copper current carrying conductors are installed in a conduit.
00:07
The conduit is installed in an area where the summer time temperature t is equal to 138 degrees fahrenheit.
00:16
What is the maximum size ocp present? that is over current protection permitted to protect the conductors in the conduit.
00:26
The maximum allowable ampacity of a conductor is influenced by factors like temperature, conductor insulation type and all these number of conductors.
00:36
To determine the maximum size over current protection, we should have the ampacity and the rating factors.
00:44
We are given conductor size is equal to 10 a b g by thwn copper.
00:59
The number of conductors is equal to 5 and the temperature is equal to 138 degrees fahrenheit.
01:08
The temperature correction is the ampacity adjustment factors.
01:13
We need to adjust the conductor ampacity based on the ambient temperature and conduit fill.
01:20
We need to adjust the conductor ampacity based on the number of conductors in the conduit.
01:28
For this particular set of conductor, the conductors at a temperature of 90 degrees celsius, the ampacity is equal to 40 a.
01:47
We need to check for the temperature correction factor.
01:52
The correction factor for 138 degrees fahrenheit is 0 .91...