150m Cable run outside to spur?

[Plonker 3]

Yes, there was reason why that section was opened. This thread is one of them.

 

[Plonker 3]

Right well if thats what I need to do Ill get it. thats was easy

About half an hour too late

Now, what are the power ratings of the transformers at 230 volt?

 

[happysteve]

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"?

 

[Connor2425]

About half an hour too late

No Dilb instead of the **** comments you should just ask that if you trying to help, if not dont bother

 

[Plonker 3]

I did try, but your attitude stinks.

 

[Darkwood]

Volts drop has different allowances for specific load types although at such low load it may not effect cable size we need to know the load characteristics not just the load rating ...i ask a few times as you haven't responded with an answer we cannot really give assistance... the distance is excessive so for our help you need to answer what we ask ... if it was several meters we could give an educated guess ... the supply has to meet ZS requirements so trip times are met under fault again not to difficult with short runs but 150m is a bit of a run... i have 3 pubs within 150m of my house by comparison.

 

[Connor2425]

HappySteve, thanks for the info, Dilb take note.

 

[happysteve]

Knew there was summat. Zs. Sorry. ~embarrassed~

 

[Connor2425]

Volts drop has different allowances for specific load types although at such low load it may not effect cable size we need to know the load characteristics not just the load rating ...i ask a few times as you haven't responded with an answer we cannot really give assistance... the distance is excessive so for our help you need to answer what we ask ... if it was several meters we could give an educated guess ... the supply has to meet ZS requirements so trip times are met under fault again not to difficult with short runs but 150m is a bit of a run... i have 3 pubs within 150m of my house by comparison.

Ok so ill get the relevant info when on site tomorrow.

 

[happysteve]

HappySteve, thanks for the info, Dilb take note.

Nah, don't thank me, and I'll reiterate don't listen to me. Just learning, and as DW states above I made a rooky error because I forgot summat basic.

To be honest, I'm more with Dillb on this...

 

[ipf]

HappySteve, thanks for the info, Dilb take note.

Trainees are always tops when it comes to advice.......no offence Happy S

 

[Darkwood]

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"?

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.

 

[Plonker 3]

But what about the spark who you was getting to do the job? Wont he be able to tell you tomorrow?

 

[Connor2425]

But what about the spark who you was getting to do the job? Wont he be able to tell you tomorrow?

Dilb forget it seriously your obviously not reading the posts

 

[happysteve]

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.

Point taken.

 

[Connor2425]

Happysteve its more the fact that you was trying to help

 

[Connor2425]

alot of assumptions on here

 

[Plonker 3]

We have been trying to help, you choose to ignore us as we wont commit until we have ALL the relevant information.

Sorry if you choose to ignore this but really, you are putting alot at risk by asking for a rough guess.

 

[spark 68]

Dilib and DW were trying to help you, only you don't know enough about what it is you were asking.

 

[Plonker 3]

alot of assumptions on here

Who has been assuming?