Thanks for all the help man. I'm always uncertain about the temp of the wire I should be using when the equipment isn't marked, if you could please help me out with this thanks.
Happy it helped. If you are not sure about terminating temperatures, or if a question does not state, you can reference 4-006 2), as these are the "defaults" if not given. 100 amps or less (or using a no. 1 awg or smaller) = 60 °C, more than 100 amps (or using larger than no. 1 awg) = 75 °C.
When applying the thanks D3 note 3 table, we must only use the insulation temperature. If the insulation is say, RW90, we would use the 90 °C row. Even if all termination temperature were 75 °C.
If I was unaware of the voltage at all I would default to the values on D3 to be safe, which is based off of 120V. If you are wondering about when to apply the 1.155 allowance for the phase loads, it only comes into play when it is more than two current carrying conductors. Voltages should be stated unless there is an indication of how to obtain them, or there is an agreed upon default if this is an academic question.
thanks for asking, had the same question. Looking at the circuit with only 2 conductors I assumed 120V since 208 is the 3 phases voltage (120*rs(3)) = 208, I don't know if it ok to get 2 phases of the 3 phases to power a resistive load
4-006 would require us to use the lowest termination temperature to determine the column used at table 2, when selecting a conductor. Given that there is 75°c stated on the panel and load, we would select from the 75°c column.
my wife is binge watching netflix and i am binging your channel. God bless.
You have well logically explained it. Thank you.
Another amazing video. Thanks!
Thanks for a very concise explanation. That was great!!!
Does it differ in any way for voltage drop for 3-phase branch cct calculations?
Thank you.
Thanks for all the help man. I'm always uncertain about the temp of the wire I should be using when the equipment isn't marked, if you could please help me out with this thanks.
Happy it helped. If you are not sure about terminating temperatures, or if a question does not state, you can reference 4-006 2), as these are the "defaults" if not given.
100 amps or less (or using a no. 1 awg or smaller) = 60 °C, more than 100 amps (or using larger than no. 1 awg) = 75 °C.
@@schulerruler thank you very much.
@@schulerruler hey Chris I was reviewing some voltage drop questions and I've noticed in the example at the bottom of TD3 it used a 90° column
When applying the thanks D3 note 3 table, we must only use the insulation temperature. If the insulation is say, RW90, we would use the 90 °C row. Even if all termination temperature were 75 °C.
how would you solve this if they didn't give you the 120/208-panel values?
If I was unaware of the voltage at all I would default to the values on D3 to be safe, which is based off of 120V. If you are wondering about when to apply the 1.155 allowance for the phase loads, it only comes into play when it is more than two current carrying conductors.
Voltages should be stated unless there is an indication of how to obtain them, or there is an agreed upon default if this is an academic question.
thanks for asking, had the same question. Looking at the circuit with only 2 conductors I assumed 120V since 208 is the 3 phases voltage (120*rs(3)) = 208, I don't know if it ok to get 2 phases of the 3 phases to power a resistive load
Prefect
How about dealing with 3 phase, 347/600v feeder services?
You will also need to use the multiplier for a three phase calculation of 1.155.
Again what rule prompted you to use the 75 degrees?
4-006 would require us to use the lowest termination temperature to determine the column used at table 2, when selecting a conductor. Given that there is 75°c stated on the panel and load, we would select from the 75°c column.
@@schulerruler And what if our equipment was rated at 60/75degrees but under 100 AMP
How about office and warehouse calculations. Help ll be appreciated.