00:01
Hi students, here in the question firstly for a 60v, 480v, 3 phase, linear load, we have the runs at the maximum amperes of 5 hours.
00:19
So calculating the current i, i equals to p upon v that is equals to 60 ampere.
00:26
We need to determine the branch circuit conductors using nce that national electrical code.
00:32
According to nce, we first select the next standard ampere rating for the circuit breaker.
00:40
The next standard ampere rating for 60 ampere circuit is 70 ampere.
00:44
Therefore, the branch circuit conductor should have 6 awg and the over current protection should be 70 awg that is for 60 ampere current it should be 6 awg and the over current protection should be 70 ampere.
01:15
For 120v branch circuit that supplies cord and plug connected linear 15 ampere load that operate continuously and operate at maximum amplicity of 20 minute duration and also supplies a linear 22 .5 ampere.
01:29
Let us calculate the current in each load...