Residential Load Cals
- Thread starter msext
- Start date
- Status
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Residential Load Cals
Are you using the standard or optional calculation? Are you using the correct voltage, IE 230 or 240?
Are you using the standard or optional calculation? Are you using the correct voltage, IE 230 or 240?
Re: Residential Load Cals
There are 4 questions 2 with optional and 2 with standard. 2 deal with single and 2 usuakky deal with multi (ex 10 units). I am using 240. I do understand though that you do round up but when I get something like 450 and the answers are all in the 300 amps Im a bit perplexed. I folowwed the book step by step (you are allowed books in the exam)
There are 4 questions 2 with optional and 2 with standard. 2 deal with single and 2 usuakky deal with multi (ex 10 units). I am using 240. I do understand though that you do round up but when I get something like 450 and the answers are all in the 300 amps Im a bit perplexed. I folowwed the book step by step (you are allowed books in the exam)
bphgravity
Senior Member
- Location
- Florida
Re: Residential Load Cals
When it comes to service and feeder calculations and you end up with a number with a higher value than any of the answers given, you most likely have not applied an allowable demand factor to one or more loads.
When you end up with a number that is smaller than any of the answers given, you most likely missed adding in a required load.
And finally, when you number is close by only + or - 10% of any of the answers given, you mosty likely made a mathematical error or used the wrong constant value, such as connected voltage.
When it comes to service and feeder calculations and you end up with a number with a higher value than any of the answers given, you most likely have not applied an allowable demand factor to one or more loads.
When you end up with a number that is smaller than any of the answers given, you most likely missed adding in a required load.
And finally, when you number is close by only + or - 10% of any of the answers given, you mosty likely made a mathematical error or used the wrong constant value, such as connected voltage.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Residential Load Cals
I?m not a ?fellow electrician,? but I am a Washington State Electrical Administrator. I have two suggestions, but both would require that you remember enough of the question and the answers that given as choices. One is to write up the question and the choices, then write up your answer, and post it here. You will find many who are willing to offer comments and suggestions. The other is to send me a Private Message, and I?ll give you an email address. Perhaps I can be of some assistance off-line.
Here?s another thought: Have you seen any example questions in the back of the NEC, or in the Handbook, or somewhere else, that are like the ones you saw on the test? Were you able to work them out and get the right answers?
I suspect that Bryan has the key to your problem. I suspect that you are not taking advantage of an available demand factor.
I?m not a ?fellow electrician,? but I am a Washington State Electrical Administrator. I have two suggestions, but both would require that you remember enough of the question and the answers that given as choices. One is to write up the question and the choices, then write up your answer, and post it here. You will find many who are willing to offer comments and suggestions. The other is to send me a Private Message, and I?ll give you an email address. Perhaps I can be of some assistance off-line.
Here?s another thought: Have you seen any example questions in the back of the NEC, or in the Handbook, or somewhere else, that are like the ones you saw on the test? Were you able to work them out and get the right answers?
I suspect that Bryan has the key to your problem. I suspect that you are not taking advantage of an available demand factor.
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