length of cable runs

[i=p/u]

is this correct for lighting circuit of 1.5mm line and 1mm cpc
ze+R1+R2=zs

b6 mcb ze R1+R2
6.18ohms - 0.8ohms =5.38ohms


cable per meter = 0.03020ohms so 5.38ohms/0.03020=178.1M

does this mean my lighting circuit can be this length 178M and still be within zs value... cheeers if makes sense

 

[Guest 004]

you have decide when i am telling the truth ! , and when I sandwich a 'lie'

 

[i=p/u]

well you never know, massive ground floor with loads of switching postions,. would cover that distance quite easy

indeed you can, but do you really need to run a circuit that long?

 

[i=p/u]

b ut thank you

 

[Guest 004]

well you never know, massive ground floor with loads of switching postions,. would cover that distance quite easy

2.5mm is your friend

 

[IQ Electrical]

you have decide when i am telling the truth ! , and when I sandwich a 'lie'

I haven't struggled to differentiate so far!

 

[Guest 004]

Indeed IQ

 

[telectrix]

or a 1.5mm ring final, doubles the possible load as well. you've got to walk all the way back so you might as well pull a return leg in while you're at it,

 

[Guest 004]

Just wait until I have an surreptitiousness episode

 

[Guest 004]

or a 1.5mm ring final, doubles the possible load as well. you've got to walk all the way back so you might as well pull a return leg in while you're at it,

??? That reminds of a house I tested a couple of year's ago where all the lighting circuits were done in 'rings' and the power in radials, and amazingly it passed!, the guy was very eccentric, and he had rewired the house himself. Got a tad confused me thinks

 

[IQ Electrical]

??? That reminds of a house I tested a couple of year's ago where all the lighting circuits were done in 'rings' and the power in radials, and amazingly it passed!, the guy was very eccentric, and he had rewired the house himself. Got a tad confused me thinks

You can't really argue with the principal I suppose.

I talked to a chap a few weeks ago who proudly informed me that he had rewired his own house entirely in MICC!

I made a joke about his unistrut fire surround and medium duty return flange tray plate shelving but it fell on deaf ears!

 

[i=p/u]

or just have 2 circuits, but if i was jumping to 2.5mm, how do i work out my distance then??? lol, im nuts

 

[Guest 004]

yeah, not in the guide that one is it

 

[i=p/u]

nope but your good old self is online would i multiply distance by 1.67

 

[Guest 004]

hhmm, i will give you the answer, you do the math ok

145 meters, will give you a VD of 6.88 V, based on a 60898 MCB

 

[Guest 004]

a little lesson in there for all I feel