Do I need an engineer for this calculation?

[olly]

Wondering if any one can help a new small business guy with this brain buster.
Please see the attached drawing.

All of the 15a and 20a existing circuits are VERY rarely used with the exception of one for a motorized gate. The others are pretty much never used.

I have always been taught to size the conductors / VD to the load being used

Each compactor pulls 28a full load current 120/240 single phase

Will the inspector want to see a calculation from a engineer? If I can do it would someone please explain roughly how?

You all are greatly appreciated! Teaching the young guys.

 

[hbiss]

Probably not, but I haven't seen the drawing.

-Hal

 

[tom baker]

What is the calculation you need? Lots examples in the back of the NEC

 

[paulengr]

You size conductors for ampacity (current). Voltage drop is not code required. It’s another requirement but not a legal one. Engineers usually get involved even further up when you look at coordination. If engineers were required on sizing houses couldn’t be built without a lot more engineers and they are too lazy for that.

 

[Beaches EE]

"without a lot more engineers and they are too lazy for that." Ouch.

 

[olly]

Probably not, but I haven't seen the drawing.

-Hal

I posted a new thread with the calc please tell me what you think

 

[olly]

What is the calculation you need? Lots examples in the back of the NEC

I posted a new thread with the attached design, please check it out

 

[charlie b]

The new thread is here:

Please help new business owner with this calc

Wondering if any one can help a new small business guy with this brain buster. Please see the attached drawing. All of the 15a and 20a existing circuits are VERY rarely used with the exception of one for a motorized gate. The others are pretty much never used. I have always been taught to size...

forums.mikeholt.com

To avoid duplication threads, I will close this one.