Bob Schuman
Member
- Location
- Hawley, Pa
Can someone explain how to calculate expected peek demand on a residential home
Calculating Expected Peek Demand on a residential house
- Thread starter Bob Schuman
- Start date
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jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
There's an entire nine page article in the code on this, Article 220. I'd say read it through and ask us specific questions if you don't understand. Basically you take the square footage of the living space and multiply it by a required factor, then add all the other specific loads and appliances, and then you get to reduce those by specific factors listed in that Article. That's about as concise an explanation as can be given.
This, by the way, is what the code requires. It may or may not be a realistic calculation of what peak demand will really be. That really depends on who lives in the house.
This, by the way, is what the code requires. It may or may not be a realistic calculation of what peak demand will really be. That really depends on who lives in the house.
Iron_Ben
Senior Member
- Location
- Lancaster, PA
If the home has a smart meter, the actual peak kw demand info is likely to be available. It may scroll across the meter every 20 seconds or so. Or it may be available via the utility's website or is some other fashion. Some utilities make the info easy to access and some don't.
Bob Schuman
Member
- Location
- Hawley, Pa
Thank You for your response, I did use Article 220 to calculate the connected load but the utility Co. was asking for expected peek demand on there load sheet. I have not found anything in the code book. I would think you are right about how the house will be used will change the peek demand.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
Just being pedantic, but I wanted to help you not make this mistake with others...
There is "peak" as in the top;
but "peek" is something you do to around a corner...
To help remember, the peak as in the top of something, has an "A" in the middle, that looks like a mountain peak.
My older sister is an English teacher, I had this stuff drummed into me as a kid.
There is "peak" as in the top;
but "peek" is something you do to around a corner...
To help remember, the peak as in the top of something, has an "A" in the middle, that looks like a mountain peak.
My older sister is an English teacher, I had this stuff drummed into me as a kid.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
The peek load on the house depends on how many windows do not have curtains and the number of sex offenders in the neighborhood. :angel:
JFletcher
Senior Member
- Location
- Williamsburg, VA
Welcome to the forum.
A load calculation per 220 is all you can do. That # is frequently much higher than the actual load most people will use anyway.
Peak demand is more for industrial customers; the POCO has to be able to provide the maximum demand they might pull in a 15 minute period the entire year. Quick story, back when I worked for HRSD, they had one plant that turned on a second 1,000HP aeration blower for a 45 minute test. That new, higher peak cost them close to $53,000 from the POCO.
While we're being pedantic, it's "their" not "there". Don't worry though; if electrical licenses were revoked for improper forum grammar, especially using "it's" where "its" is correct, no one here would have a license.
A load calculation per 220 is all you can do. That # is frequently much higher than the actual load most people will use anyway.
Peak demand is more for industrial customers; the POCO has to be able to provide the maximum demand they might pull in a 15 minute period the entire year. Quick story, back when I worked for HRSD, they had one plant that turned on a second 1,000HP aeration blower for a 45 minute test. That new, higher peak cost them close to $53,000 from the POCO.
While we're being pedantic, it's "their" not "there". Don't worry though; if electrical licenses were revoked for improper forum grammar, especially using "it's" where "its" is correct, no one here would have a license.
kwired
Electron manager
- Location
- NE Nebraska
There is a small number of members that may still have a license.While we're being pedantic, it's "their" not "there". Don't worry though; if electrical licenses were revoked for improper forum grammar, especially using "it's" where "its" is correct, no one here would have a license.
Jraef is one of them, if he failed his sister would have straightened him out.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
It is odd for a utility to ask for that figure for a resi customer. I would guess it is a generic sheet and you dont need to provide that information for residential.
mgookin
Senior Member
- Location
- Fort Myers, FL
That's a good one; I'd never heard that.
One I learned is "I before E except after C, or when sounding like A as in neighbor or weigh; neither leisure foreigner seized the weird height; conscience, science." While that covers most of the exceptions, there are a few which it does not include.
Wow!
mgookin
Senior Member
- Location
- Fort Myers, FL
If it's a big house and the only customer on the transformer I'd appreciate them asking. It's sure better than having the customer call a week after moving in saying the lights are dimming when the A/C comes on.
Peak***
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