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HFs vary alot in efficiency, manufacturers data will help but if its running 10.8 you have little choice but to go C16, 1.5 might work if the runs are not too long
 
HFs vary alot in efficiency, manufacturers data will help but if its running 10.8 you have little choice but to go C16, 1.5 might work if the runs are not too long

The run is 10 metres mate what do you think I can easily change the wiring to 2.5mm for a c16 or change the mcb to a c10.
 
What about if you use the R2 method?


I always record the highest reading.

Agreed on a ring with spurs, with a Radial how can a higher reading be anywhere except at the end unless you have a fault or an external influence ? If you have done the r1 stuff first, I fail to see how the impedance can be higher mid circuit than end circuit on a Radial ?
J
 
You say it is pre-wired? Did it come with any literature/manufacturers instructions? If so, these would probably tell you what overcurrent device you need to fit, and you can install the supply accordingly.
 
Just a personal preference, but checking every point ensures all current using points meet the required Zs rather than relying on a installation being perfect because one other test says all is good.
 
The run is 10 metres mate what do you think I can easily change the wiring to 2.5mm for a c16 or change the mcb to a c10.

A C16 can run on 1.5 if you can get the right ZS readings for it. Fitting a C10 is high risk if its running 10.8 now, you could well be back after tripping in hot weather assuming it stays in long enough for you to leave the premises.
I cannot say because i dont know you total cable run through the switches and the Zdb.
What i do is (before ordering cable) measure Zdb stride the cable run for an idea of cable length then over a coffee decide how many circuits and how fat a cable to use.
You wont get a definitive answer here because your variables are unknown, but i would be surprised if you cannot make it work on a C16 and 2.5, as you have run the cables, if your ZS at the end of your run is less than 1.16ohms than fit a C16, if its greater then oops,
 
Just a personal preference, but checking every point ensures all current using points meet the required Zs rather than relying on a installation being perfect because one other test says all is good.

Agree. Picks up any loose connections that way.
 
The correct method for calculating the protective device is as follows.

30 x 58 x 1.8 = 3132 W

3132 Divide be 230V = 13.61A

The protective device should be 16A

The normal type this type or lighting should be type C.

Cable calculations should be based on a load of 13.61A
 
As the others have said, check your Zs at the end of line (should be the highest) and just make sure it doesnt exceed the maximum value given for the mcb you require. (in this case a Type C)
If it does exceed that value, how about changing for an rcbo? Or reduce the earth loop impedance by adding supplementary bonding (if practical)
 
As the others have said, check your Zs at the end of line (should be the highest) and just make sure it doesnt exceed the maximum value given for the mcb you require. (in this case a Type C)
If it does exceed that value, how about changing for an rcbo? Or reduce the earth loop impedance by adding supplementary bonding (if practical)

Or carry out cable calculations and get it right first time.
 
As the others have said, check your Zs at the end of line (should be the highest) and just make sure it doesnt exceed the maximum value given for the mcb you require. (in this case a Type C)
If it does exceed that value, how about changing for an rcbo? Or reduce the earth loop impedance by adding supplementary bonding (if practical)


Why do electricians need to be reminded of this stuff time after time?
 

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