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HappySteve, thanks for the info, Dilb take note.
Trainees are always tops when it comes to advice.......no offence Happy S
Discuss 150m Cable run outside to spur? in the DIY Electrical Advice area at ElectriciansForums.net
HappySteve, thanks for the info, Dilb take note.
I'm just a trainee so don't listen to me, I guess the following is more aimed at the experienced and qualified folks:
If the largest voltage drop I can find in appendix 4 of the OSG is 44mV/A/m (1mm^2), then the largest voltage drop is going to be 6.6V/A over 150m. Assuming these 3 transformers are not wildly inefficient, they're going to be drawing less than an amp at 230V... so even if they're not switch mode PSUs they're probably still going to be ok.
So (aside from environmental protection and other stuff I've not thought of and have yet to learn about), what's up with doing a rough calculation as above and saying, "the smallest SWA you can get"?
But what about the spark who you was getting to do the job? Wont he be able to tell you tomorrow?
Rough calculation can be taken as gospel if advised on a forum you go to help from.. we don't do rough as it can in certain cases risk life... we are advising people with no electrical background sometimes and if we suggest it may need a competent person to look at the set-up its usually because we cannot attain the correct info or we believe the Poster is at risk themselves tying to do something with limited knowledge.
So were the others. They were asking for more information, in the main. Without knowing more details, they can't advise properly.Happysteve its more the fact that you was trying to help
Voltage 12VDC
Current (Max) 1.5A
Current (Min) 0A
Load Regulation +/-3.75%
Over Voltage Protection 15VDC
Over Current Protection 3.2A Max
Short CircuitPotection Yes
Ripple Voltage (L.F) 100mV p-p
O/P Connector N/A
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Hi Pot Test I/P-O/P 3KVAC
Insulation I/P-O/P 7Mohm Min
Temperature
Operating 0 to 40’C
Storage -20 to 70’C
H
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m
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i
t
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Operating 35% to 85% Non Condensing
Storage 5% to 95% Non Condensing
I
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Voltage 90 to 264VAC
Frequency 47 to 63Hz
Current RMS (Max) 680mA Max
Inrush Current 60A Max
Leakage Current 0.25mA
Efficiency (Min) 70% Min
I/P PLUG TYPE (2Mtr Mains Lead) N/A
MTBF 50K Hours
Designed In Accordance With:
Safety Standard IEC 60950-1
EMC Standard EN 55013 EN 6100-3-2 EN 61000-3-3 EN 6100-6-1
Voltage 12VDC
Current (Max) 1.5A
Current (Min) 0A
Load Regulation +/-3.75%
Over Voltage Protection 15VDC
Over Current Protection 3.2A Max
Short CircuitPotection Yes
Ripple Voltage (L.F) 100mV p-p
O/P Connector N/A
S
a
f
e
t
y
Hi Pot Test I/P-O/P 3KVAC
Insulation I/P-O/P 7Mohm Min
Temperature
Operating 0 to 40’C
Storage -20 to 70’C
H
u
m
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d
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Operating 35% to 85% Non Condensing
Storage 5% to 95% Non Condensing
I
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p
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t
Voltage 90 to 264VAC
Frequency 47 to 63Hz
Current RMS (Max) 680mA Max
Inrush Current 60A Max
Leakage Current 0.25mA
Efficiency (Min) 70% Min
I/P PLUG TYPE (2Mtr Mains Lead) N/A
MTBF 50K Hours
Designed In Accordance With:
Safety Standard IEC 60950-1
EMC Standard EN 55013 EN 6100-3-2 EN 61000-3-3 EN 6100-6-1
Blown away with how helpful this forum has been tonight.
Its this simple, 2 people supplied quotes with 2 different cable sizes on.
I wanted some helpful suggestions on what size is suitable, I have gievn you all the relevant info.
On a further note ... if you have 2 quotes with requested cable size differences ask the companies with the largest cable why it need to be that size and not the size of the other quotes .... if they give you a calculation throw it on here and we can confirm it this.. but youll be surprised how many legit companies think running standard twin and earth outside is ok i would be doing this in SWA so look to this on the quote although your determination to seek the answer and from previous threads you have started are you sure your not doing this yourself??? You must have loads of contacts by now to give you assistance.... just saying
So all the power supplies are different distance from the source?
I never said I was doing this myself, you are assuming it.
I have been asked by my customer (whom I am installing a cctv system with poles remote in a yard, hence the external power source) if I can take care of the electrical side, so i am getting quotes to do this.
I have been given 2 cable sizes over that distance, I wanted advice off other sparks on that distance, if its not possible fair enough.
Hindsight for you had you supplied all this info the responses would have been kinder .... and my post was just in jest hence the winking emoticon no offense meant...
On an helpful note id ask all the quoting companies to provide the calculations for the cable size as you have been given several different sizes ... trust me those who know their stuff will happily provide the calcs to confirm why it is said size.
That's why we get to charge so much!I tend not to deal with the elec side for this reason, clear as mud.
I got the answer this morn in one phone call, thanks anyway.
Reply to 150m Cable run outside to spur? in the DIY Electrical Advice area at ElectriciansForums.net
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