Tom Henry Journeyman Practice Question - Electrician Talk - Professional Electrical Contractors Forum
 Electrician Talk - Professional Electrical Contractors Forum Tom Henry Journeyman Practice Question
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 08-08-2016, 08:09 PM #1 Member   Join Date: Mar 2016 Posts: 77 Rewards Points: 18 Tom Henry Journeyman Practice Question I was working through my Tom Henry book tonight and doing one of the journeyman practice exams (I'm taking the test tomorrow.) And am wondering if I'm missing something. Question #8 is asking for the MAXIMUM demand on twenty eight 8kw ranges in an apartment complex. Looking at table 250.55 column C gives me 43kw for the 28 ranges. But column B goes up to 8.75kw. The demand factor in column B for 28 ranges is 24%. 28 × 8kw = 224kw × 24% = 53.76kw. Am I reading something wrong? When asking for the MAXIMUM demand what exactly are they looking for? Attached Thumbnails
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 08-08-2016, 09:02 PM #2 Junior Member   Join Date: Aug 2014 Location: California Posts: 5 Rewards Points: 10 In the table title says that you are supposed to use column C from the table for all cases except as otherwise permitted in note 3. For column B or C you have to use the nameplate ratings and apply the demand factor. I don't think that the question gives you this information. Sent from my iPhone using Tapatalk
08-09-2016, 02:37 PM   #3
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Quote:
 Originally Posted by apprntice In the table title says that you are supposed to use column C from the table for all cases except as otherwise permitted in note 3. For column B or C you have to use the nameplate ratings and apply the demand factor. I don't think that the question gives you this information. Sent from my iPhone using Tapatalk
But since we're dealing with 8kw appliances we meet the criteria for column B (3.5kw through 8.75kw) and would apply the demand factor of 24%, right?
That shouldn't change because it's an apartment complex; those are still classified as dwelling units.
The answer key for that particular exam was kinda funky anyways giving mixed answers (saying C when it really meant D and stuff like that.)

My only thought would be what do they mean by the "maximum demand" on these 28 ranges? A demand factor is an adjustment, so are they actually looking for the largest adjustment to the demand, which would be the smaller draw on the service? Or did they straight up want the maximum demand (must amps possible) on the service?

 08-10-2016, 08:19 PM #4 Junior Member   Join Date: Aug 2014 Location: California Posts: 5 Rewards Points: 10 I'm sorry I missed your reply, how was the test did you pass? Sent from my iPhone using Tapatalk
 08-11-2016, 04:25 PM #5 Member   Join Date: Mar 2016 Posts: 77 Rewards Points: 18 Feeling pretty good about. My fire marshals office is just now switching to doing anything online, so it'll be a few weeks before i get my score back.
 09-02-2016, 06:01 PM #6 Member   Join Date: Mar 2016 Posts: 77 Rewards Points: 18 Ended up passing with a 98%. Sweet. Service Call, Majewski and Kenken2972 like this.
 09-02-2016, 06:11 PM #7 Senior Member   Join Date: Oct 2015 Location: South East US Posts: 1,153 Rewards Points: 1,198 Congrats. Glad to see you studied to blow the test out of the water.
 09-02-2016, 06:45 PM #8 Big nosed attic troll     Join Date: Jan 2016 Location: In a van down by the river! Posts: 7,257 Rewards Points: 2,240 Congratulations dude!!!! Very happy for you! __________________ I've been alive as long as I can remember.
09-02-2016, 07:32 PM   #9
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Quote:
 Originally Posted by skittles Ended up passing with a 98%. Sweet.
Outstanding job bro, congrats!
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 09-03-2016, 09:18 AM #10 Senior Member   Join Date: Oct 2008 Location: SE Wisconsin Posts: 1,257 Rewards Points: 1,268 You probably would have done better if you just applied yourself a little more. Thanx for the update. Congrats!
 The Following User Says Thank You to ralpha494 For This Useful Post: skittles (09-03-2016)
09-03-2016, 10:30 AM   #11
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 Originally Posted by ralpha494 You probably would have done better if you just applied yourself a little more. Thanx for the update. Congrats!
I know.... -_- i still haven't been able to tell my father. He'd be so disappointed in me.

 09-03-2016, 10:31 AM #12 Big nosed attic troll     Join Date: Jan 2016 Location: In a van down by the river! Posts: 7,257 Rewards Points: 2,240 Hahahahaahha Ralph. __________________ I've been alive as long as I can remember.
 09-04-2016, 03:37 PM #13 Senior Member     Join Date: Feb 2016 Location: Boston Area Posts: 962 Rewards Points: 810 Good to see you put the effort in and it paid off. Congrats. Majewski likes this.
09-05-2016, 12:42 AM   #14
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Quote:
 Originally Posted by skittles I know.... -_- i still haven't been able to tell my father. He'd be so disappointed in me.
But your mom should have your back at anything over a 90, so no sweat.
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