I am going to be wiring a cabinet shop about 4,000sq. ft. and need to do some load calcs for service size. my question is there is a bunch of different machines that will not be used at the same time and I don't want to just take the sum of the name plate ratings to come up with a number. Is there code section that will guide me in figuring the correct service size based on demand not "what if ".
Load calc. question
- Thread starter acrwc10
- Start date
- Status
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I believe you have to calculate all the motors unless you have some control that will limit some machines from coming on while others are on ( like a Double throw switch). This shop may one day have more people working in it.
wirebender
Senior Member
- Location
- North Central Texas
IMSO, 220.60 (2005) would apply, but I could be wrong.
Note that it says "unlikely" , not "unable".
Note that it says "unlikely" , not "unable".
mdshunk
Senior Member
- Location
- Right here.
You'd have to gauge the customer a little bit. A 4,000 square foot shop sure sounds like he wants employees at some point in time. If it was me, I'd add up all the coincidental loads and throw in a couple-few of the other big motors just for a cushion. Don't forget about stuff that runs coincidentally even if only one man is working like fume hoods, exhaust fans, air compressors, and dust collectors.
This is a small business that has employees , they do have a good idea of what gets used at the same time. I don't think enough people could fit in the shop to run all the equipment at the same time.
Just don't want to supply to little power for them.
Just don't want to supply to little power for them.
cadpoint
Senior Member
- Location
- Durham, NC
- Occupation
- Electrician - but not by NC Law.
I believe you need to understand more of your clients critical path of their work flow.acrwc10 said:
Besides all the other fine suggestions made earlier, all sorts of question came to my mind:
Is all equipment to be fixed in place?
Are there any aerial drop requirements?
Do you have mixed services to any machines, not just due Power but air / or even gases.
Does any equipment inhabit light requirements or layouts?
Are all emergency requirements met, are any required to include panic shout-offs >?
Space requirements for disconnects or service poles drops at equipment,
and addition labeling for point of service usage?
Tissue paper (onion skin) and a timely template (a plastic template of various shapes and sizes) from the drafting store is very in-expensive and they can draw and tape down all the shapes to fit there desired layout very quicking and one can keep laying in down and add another tissue...
cadpoint said:
To most of your questions "Yes"
I thought of most of the same things, and I am going to visit the existing shop that they will be relocating from. I do like having all the questions to consider ahead of time, Thank You for the input.- Status