mrtweaver
Member
I am not sure if this is a topic for this group or not but I thought I would post it here and see what the general consenus is.
An older electrician here on site is preparing to retire. Two months and he will be gone. He and I are having a debate on fuses and overloads as protection.
We have 7 motors which all feed a trash collection system. We are interlocking them to the main drive motor on the system which is controlled via a freq drive.
If the main drive drops out it drops a relay out which supplies the 120Vac to contactors which will be connected between the mains and the 7 motors listed above.
Now if you look at the newer equipment we have purchased and even if you look at the older conveyor system. All of those engineers put in Fuses, then Circuit breaker, then contactor, then overloads then out to motor. To me this meets code.
The older electrician says the overloads are not needed that fuses will provide ample protection for the 7 motors. I say we need to put in overloads for added safety and code.
So the main question is who is right here, I say I am right and that code says you should put overloads on inductive loads such as motors and it should be done after the contactor. He says he is right and fuses will provide enough protection.
Thanks for reading and have a great day.
An older electrician here on site is preparing to retire. Two months and he will be gone. He and I are having a debate on fuses and overloads as protection.
We have 7 motors which all feed a trash collection system. We are interlocking them to the main drive motor on the system which is controlled via a freq drive.
If the main drive drops out it drops a relay out which supplies the 120Vac to contactors which will be connected between the mains and the 7 motors listed above.
Now if you look at the newer equipment we have purchased and even if you look at the older conveyor system. All of those engineers put in Fuses, then Circuit breaker, then contactor, then overloads then out to motor. To me this meets code.
The older electrician says the overloads are not needed that fuses will provide ample protection for the 7 motors. I say we need to put in overloads for added safety and code.
So the main question is who is right here, I say I am right and that code says you should put overloads on inductive loads such as motors and it should be done after the contactor. He says he is right and fuses will provide enough protection.
Thanks for reading and have a great day.