Load Calculation Question 1

[zbomb]

Hi, newbie here. I'm trying to find a calculation to determine the load on a branch circuit. I looked at the National Electric Code Book, but I found a few different equations, I'm looking for a commercial application. Thanks in advance!!

 

[davidbeach]

Well, there are different equations because there are different types of branch circuits. Given the amount of information in your question, I could just pull a number out of the air and be as accurate as any other approach.

What is the branch circuit, what is the breaker (or fuse) protecting the branch circuit, what is the load, etc., etc.?

 

[zbomb]

I'm not sure of the specifics. I was asked the question in general and I think that the person asking the question was just looking to see if there was a rule of thumb or something like that to use.

 

[davidbeach]

No, there is not a rule of thumb, is there a rule of thumb for column or beam loads?

 

[briand2]

zbomb,

Yes, there are rules of thumb (but of course, like any branch of engineering, that's all they are!).

For instance, depending upon the type of building, you can estimate the small power (i.e. single phase items plugged into socket outlets) at xx W/m2 (or W/ft2 if you're not in the UK where I work!).

You really do need to know more detail of the equipment and / or environment type being served.

Brian