Residential calculation

[kda3310]

I am trying to learn how to do residential calculations and how or why to use optional method. Does any one know of a free website to learn how to do this.

 

[ActionDave]

Use the examples in annex D in the back of your code book. They are the best reference that I know of for this.

 

[iwire]

Use the examples in annex D in the back of your code book. They are the best reference that I know of for this.

That is how I do it.

 

[Dennis Alwon]

I sent a pm with a link to a powerpoint presentation I made on optional & standard calcs.

 

[kda3310]

I sent a pm with a link to a powerpoint presentation I made on optional & standard calcs.

Thank you for the link. Is these some where that gives practice load test calculations. Like if I wanted to work one out by hand and be able to check if I am right.

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[Dennis Alwon]

Thank you for the link. Is these some where that gives practice load test calculations. Like if I wanted to work one out by hand and be able to check if I am right.

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Mike Holt has a lot of books you can purchase http://www.mikeholt.com/product-category-list.php?id=3

 

[2Broke2Sleep]

Mike holts website has a free spreadsheet for download for residential calculations. I haven't used it in a while so I couldn't tell you what limitations it has (no optional calc, auto-derate of neutral, no commercial consideration), but it's great to check your answers to when doing the calcs by hand.

 

[tadavidson]

I sent a pm with a link to a powerpoint presentation I made on optional & standard calcs.

Hey! why not post it so we can learn together?

 

[mkgrady]

Hey! why not post it so we can learn together?

I have always wondered about the optional calculations. I would like to see the difference from standard too

 

[2Broke2Sleep]

Big advantage to the optional calc is the range demand factors are bypassed. Easier calculation with some less attention to detail required. Mike holt videos teach both of them great, but you'll still have to read through the codebook to get a good grasp on them. Don't let table 220.55 intimidate you like it did me, it is actually pretty simple. Don't confuse branch circuits with service/feeder calculations. They are both contained in the footnotes of the table.

The 'standard' calc is pretty much as simple as:
1) Outside building dimensions x occupancy VA table 220.12
2) Required laundry room receptacle (1500VA) 220.52
3)Small appliance branch circuits (2 x 1500VA) 220.52
4) Air conditioning or Heating load (larger of the two) 220.60
5) Appliances 220.53
6) Cooking appliances (Table 220.55)

220.42 calc done after considering all of the above, and you can find your required size there. A thorough write-up would take a while to do, so the easiest way is to stick your nose in the book.

 

[Dennis Alwon]

Hey! why not post it so we can learn together?

I have always wondered about the optional calculations. I would like to see the difference from standard too

I sent you guys a link if anyone else wants it let me know

 

[suzan454]

Have Mike Holt written any book about plumbing?

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Plumber San Jose

 

[Dennis Alwon]

Have Mike Holt written any book about plumbing?

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]Plumber San Jose

I hope not--LOL

No he has not- he is an electrician, inspector etc who made a business from his electrical knowledge. He is not plumber.

 

[stevenje]

Have Mike Holt written any book about plumbing?

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Plumber San Jose

Mike has a great sense of humor. I would love to see his reply to this post.

 

[GoldDigger]

As stated in another thread,
Plumbers get paid for what they can do.
Electrical Engineers get paid for what they know.
Electricians get paid.

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