Residential load calculation questions

[JFletcher]

I am curious to know if anyone knows the history or reasoning behind when and why microwaves and garbage disposals were added to the NEC for load calculation purposes. To me, these two loads are a non-issue, because they typically run just a few minutes.

I disdain having to include them in load calculations, and when I do, I pretend they are other real loads that could operate for a while, such as hair dryers and vacuum cleaners, which the NEC apparently does not care one bit about.

Also curious to know if anyone submitted a proposal for the 2020 NEC to reduce the volt amps for lighting since most new installations are LED. how would I go about researching that?

And since I'm on about the CMP, what is with the constantly changing requirements for kitchen receptacles? it's patently absurd to me that a kitchen that is less than 10 years old may not be compliant with current codes.

 

[Buck Parrish]

There was a change in the 2008 NEC for section 220.52(A) and (B) to clarify that each of the small appliance branch circuits and laundry circuits must be counted at 1500 watts not just the required circuits.​

I've been doing a lot of commercial lately. But I would think being fixed in place must have something to do with it. Also the requirements for disposals circuits.

 

[Dennis Alwon]

The NEC does not speak of appliances or motors that are only on for a few seconds. For that matter, the garage door opener would also be on the list. In reality, they will do little to change the calculation