A Canundrum

[Big_Spark]

i believe you (not)

Oh you mistrusting soul you...so cynical

 

[dingbat]

That was a deliberate mistake, I was curious how long it would be before it was noticed as well

Oh, I noticed it straight away, but as you're a bit scary - - I waited until one of the bigger boys got involved! Trouble is, on a site like this, once you've called in the Grammar Police you get opened worm-cans all over the place.

 

[Big_Spark]

but as you're a bit scary -

Boo

 

[dingbat]

but as you're a bit scary -

Boo

See what I mean... I've wet myself now.

 

[Big_Spark]

See what I mean... I've wet myself now.

BOO

 

[breezer]

See what I mean... I've wet myself now.

(lucky then he didn't say "booo")

 

[Big_Spark]

Has anyone solved this conundrum yet I wonder?

 

[breezer]

if you mean regarding the 20 mins yes i have.

 

[supersparks]

I will always use 3 core, the yellow being the CPC in this situation..it also has a better volt drop

i thaught that if one is usd as cpc it would be counted as 2core as the cpc wount be carrying a load under normal conditions...

 

[Big_Spark]

I will always use 3 core, the yellow being the CPC in this situation..it also has a better volt drop

i thaught that if one is usd as cpc it would be counted as 2core as the cpc wount be carrying a load under normal conditions...

Well I'm not too sure about that as usually you would use the armouring as the cpc. I can't honestly say I've ever thopught of it like that...worth investigating further. I think I'll phone the IEE tomorrow morning and get their thoughts on the issue.

 

[supersparks]

its worth checking methinks!
tell me what they say...

 

[Big_Spark]

I will certainly post it here for all to see.

I have given it some thought whilst doing a few things in my kitchen..like washing up!! and have come to the conclusion that the reason could well be magnetic channeling at the atomic level.

If the cable is a three or four core 400V supply, then there are three magnetic fields, BUT they do not cancel out as they do in a single phase supply.

Magnetic inductance comes into play as the magnetic fields of the three supplies are out of phase, and the return on the neutrals will be a jumbled mess of return fields that will not necessarilly be in phase.

This would cause a very small magnetic field to travel up the cable as it was energised. The Neutral would cancel most of it, but enough would actually remain to allow what is called magnetic channeling. This is not something that they will teach sparks, and the only reason I know about it is due to my interest in Astro-physics and High energy physics. (My hobby is Astronomy)

I could well be way of bat here as it is not really my field, but I will lay odds that is the reason that 3 phase supplies have a lower volt drop for a given size cable.

I'll keep you all posted.

 

[dingbat]

This is not something that they will teach sparks, and the only reason I know about it is due to my interest in Astro-physics and High energy physics. (My hobby is Astronomy)I'll keep you all posted.

Now do you see what I mean about being scary???!!!

Perhaps we should all get out more?

 

[securespark]

Didn't you say 28 on 2nd drive not 34??

 

[Big_Spark]

Didn't you say 28 on 2nd drive not 34??

NO...68, 34 on each of two circuits, one on the left side of the drive, one on the right.