max demand peer workbook question help please!
Oct 9th 2009, 7:08 am
#1
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max demand peer workbook question help please!
if i have a block of 40 units how do i determin the value of 32 units with 2.0kw permenently connected strip heaters?
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Last edited by paulg1770; Oct 9th 2009 at 7:40 am.
Oct 9th 2009, 10:08 am
#2
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Re: max demand peer workbook question help please!
This is the solution form the answer sheets peer gave us to check our work.
Oct 9th 2009, 12:41 pm
#3
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Re: max demand peer workbook question help please!
Cheers pal Ill have a look at it again on monday! have you got the correct answers to alot of the calculation questions? Would be a great help so I can tell if my answers are correct. The examples in the books are not the best.
Cheers
Cheers
Oct 11th 2009, 6:21 pm
#4
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Re: max demand peer workbook question help please!
if i have a block of 40 units how do i determin the value of 32 units with 2.0kw permenently connected strip heaters?
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Oct 12th 2009, 3:42 pm
#5
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Re: max demand peer workbook question help please!
if i have a block of 40 units how do i determin the value of 32 units with 2.0kw permenently connected strip heaters?
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Oct 12th 2009, 7:08 pm
#6
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Re: max demand peer workbook question help please!
Bugger just got to this part, it was all going so well
Oct 12th 2009, 7:33 pm
#7
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Re: max demand peer workbook question help please!
Think you have to divide the units by 3 to give you units per phase
= 13, 13, 14. so youd be using the 6 to 20 living blocks per phase column.
= 13, 13, 14. so youd be using the 6 to 20 living blocks per phase column.
if i have a block of 40 units how do i determin the value of 32 units with 2.0kw permenently connected strip heaters?
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Oct 13th 2009, 12:43 am
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Re: max demand peer workbook question help please!
Oct 14th 2009, 10:39 am
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Re: max demand peer workbook question help please!
Hi all
It is a worry when you are sat at home trying to do it on your own but I attained my licence the PEER route back in Feb and I can promise you if you have a fair go at the work book and do as much as you can, the guys at PEER will go through the things you are stuck on when you do your revision day.
Maximum demand is a big part of the exam and they go over about 4 examples with you on the revision day, they show you how they like it setting out and everything.
Jon is right though when you are working out living units before you start doing any calcs split the units up over the 3 phases and set it out on a spare piece of paper.
For example 40 units and then list the loads
13 13 14
Equipment load group calc Red White Blue
Lighting A1 14 X 0.5 7A
Note remember to read the question alot of the time they are only asking for the heaviest loaded phase.
Hope this helps guys, feel free to send me a message and ill do my best to help
Mike
It is a worry when you are sat at home trying to do it on your own but I attained my licence the PEER route back in Feb and I can promise you if you have a fair go at the work book and do as much as you can, the guys at PEER will go through the things you are stuck on when you do your revision day.
Maximum demand is a big part of the exam and they go over about 4 examples with you on the revision day, they show you how they like it setting out and everything.
Jon is right though when you are working out living units before you start doing any calcs split the units up over the 3 phases and set it out on a spare piece of paper.
For example 40 units and then list the loads
13 13 14
Equipment load group calc Red White Blue
Lighting A1 14 X 0.5 7A
Note remember to read the question alot of the time they are only asking for the heaviest loaded phase.
Hope this helps guys, feel free to send me a message and ill do my best to help
Mike
Oct 14th 2009, 11:02 am
#10
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Joined: Aug 2007
Location: Gold Coast
Posts: 72
Re: max demand peer workbook question help please!
if i have a block of 40 units how do i determin the value of 32 units with 2.0kw permenently connected strip heaters?
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
Max demand table c1 columb, 5 B1. STATES 21 OR MORE LIVING UNITS PER PHASE = 50A + 1.9A PER LIVING UNIT so is that 50A straight off plus the sum of 32 units multiplied by 1.9A?
Same problem with the 10A socket outlets for all 40 units. Is it 50A straight plus 40 units by 1.9A or 50A for the 21 units and 1.9 by the remaining 19 units
Cheers lads. its on page 27 of the peer workbook if anyone has it
Also how do i get the value of 1 3phase pump motor 4.8kw(7.5A per phase) communal loading, why does it say 7.5 amps per phase? im an hour at this one, now very confussed, wish i had of been a chippy
50 + (14 x 1.9) = 76.6A the 14 being because you have split the units across the 3 phases like i showed in the example of the above post.
Strip heaters- 2000 / 230 = 8.7A
12 x 8.7 x 0.75 = 78.3A the 12 being the number of units ie 10, 10, 12 and the 0.75 being 75% of the connected load.
For the motor question no calculations are required simply add 7.5A to the heaviest loaded phase.
Mike
Oct 14th 2009, 4:57 pm
#11
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Re: max demand peer workbook question help please!
Nice one Mike, thanks for your help
Oct 15th 2009, 6:24 am
#12
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Re: max demand peer workbook question help please!
Yea cheers mate thats great stuff, fair play
Nov 11th 2009, 6:56 am
#13
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Ambient Temp Question
P68 OF THE WORKBOOK
Question 13: It is intended to install 120mm 3phase and earth .6/1 kV, copper, sheathed, V-75 insulation cable, enclosed in non metallic wiring enclosure in air, together with other 4 circuits. Ambient Temperature of the location is 50 degreesC, conductor temp. 75deg.C
What will be the resulting value of current carrying capiacity of this cable?
I can do the first half but im lost with the ambient temp part of it, could be that its mid 30s today and the sun is beaming in my window!
Any help would be great lads
thanks
Question 13: It is intended to install 120mm 3phase and earth .6/1 kV, copper, sheathed, V-75 insulation cable, enclosed in non metallic wiring enclosure in air, together with other 4 circuits. Ambient Temperature of the location is 50 degreesC, conductor temp. 75deg.C
What will be the resulting value of current carrying capiacity of this cable?
I can do the first half but im lost with the ambient temp part of it, could be that its mid 30s today and the sun is beaming in my window!
Any help would be great lads
thanks
Dec 2nd 2009, 1:34 am
#14
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Location: Adelaide...how much longer for christs sake
Posts: 196
Re: Ambient Temp Question
Hi Paul,
Im struggling a bit with these cable calcs, have you got an anwser for Q13, id like to compare!
Cheers, jon
Im struggling a bit with these cable calcs, have you got an anwser for Q13, id like to compare!
Cheers, jon
P68 OF THE WORKBOOK
Question 13: It is intended to install 120mm 3phase and earth .6/1 kV, copper, sheathed, V-75 insulation cable, enclosed in non metallic wiring enclosure in air, together with other 4 circuits. Ambient Temperature of the location is 50 degreesC, conductor temp. 75deg.C
What will be the resulting value of current carrying capiacity of this cable?
I can do the first half but im lost with the ambient temp part of it, could be that its mid 30s today and the sun is beaming in my window!
Any help would be great lads
thanks
Question 13: It is intended to install 120mm 3phase and earth .6/1 kV, copper, sheathed, V-75 insulation cable, enclosed in non metallic wiring enclosure in air, together with other 4 circuits. Ambient Temperature of the location is 50 degreesC, conductor temp. 75deg.C
What will be the resulting value of current carrying capiacity of this cable?
I can do the first half but im lost with the ambient temp part of it, could be that its mid 30s today and the sun is beaming in my window!
Any help would be great lads
thanks
Dec 2nd 2009, 3:55 am
#15
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Re: Ambient Temp Question
