Meaning of calculated load
- Thread starter m sleem
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- Lockport, IL
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- Semi-Retired Electrical Engineer
The calculation processes described in 220 take the total connected load and allow us to apply certain demand factors. The results of such calculations are the "calculated load." That is what is being cited elsewhere in the code. The notion of VA/m2 comes into play within 220. But we aren't allowed to do anything with "estimated load."
No
calculated load is just that, calculated. Just as stated above.
demand load is the actual load used at any particular time, and the requirements if you want to use demand load are in 220 also.
they can be used only if a recording meter, usually a utility demand meter, that has been in place for 1 year.
there is also a 30 day reading that can be used, but why... demand in middle of summer is different than middle of winter, spring, or fall...
calculated load is just that, calculated. Just as stated above.
demand load is the actual load used at any particular time, and the requirements if you want to use demand load are in 220 also.
they can be used only if a recording meter, usually a utility demand meter, that has been in place for 1 year.
there is also a 30 day reading that can be used, but why... demand in middle of summer is different than middle of winter, spring, or fall...
OK, i was calling it calculated demand load & actual demand load. Thanks for clarification.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Let us please not let "language" get in the way of "communication." The NEC defines some terms for us, and leaves us to follow standard industry usage for others. The word "demand" and the two word phrase "demand load" have more than one interpretation. Someone will have to check for me, as I don't have a code book handy, but my guess is that neither appears in article 100. I believe that when you start with "connected load" and take advantage of allowable "demand factors," the result can be just as accurately called "demand load" or "calculated load." These are both different than the amount of load being drawn by a building at any given moment, or over any given 30 day period, or over any given year. Article 220.87 gives us several ways to determine the "existing load" on an existing building, something that we would need to know in order to determine if more load can be added. But I would hesitate to call the results of that process the "demand load." It just causes confusion, to my mind at least.
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