Current Carrying Capacities

[Bez]

I have installed a cooker radial to my new extension in 10mm T&E, (I know it's a bit ott but I had it lying around in the shed). It's protected by a 40A MCB at the board, (On the RCD side). This terminates at the cooker switch and from there I have run 6mm T&E to the cooker box, approx 18 inches away.

A) Is it ok to step the cable down?

B) Am I sailing close to the wind with the 40A MCB Protecting the 6mm cable,

according to the OSG 6mm will carry 47Amps clipped direct.

Cheers

Bez

 

[danny7299]

just put this trough some software i use... using in a 20m length.

Cable-Mate Version 3.7.5

Cable ID / REF number :

Supply voltage = 230 Volts

Ib - design current = 40 Amps

Protective device type = RCBO type B

In - protective device rating = 40 Amps

Length of run of cable = 20 meters

Power factor = 1

Cable Type : Twin & Earth

Installation Method : Single-core or multicore cable direct in masonry having a thermal resistivity not greater than 2 K.m/W - without added mechanical protection.

method C

Ambient temp = 30

 

[Apache]

Long way of saying 'it'll be fine' Dan

 

[maccarooni]

Hi Bez

what size is the cooker.

How is your cable run to the cooker, you said cable will take 47A clipped direct, is that how yours is ?

How long is the run.

macca

 

[Cirrus]

Jeez Danny, what software is that you use mate?

 

[maccarooni]

Wow danny it took me all that time to type my little bit headbang

:coat

 

[matt.leung]

what is the cooker rated at?

 

[Bez]

Hi Bezwhat size is the cooker.

How is your cable run to the cooker, you said cable will take 47A clipped direct, is that how yours is ?

How long is the run.

macca

Cooker is only 2200w, so no probs there

Cable is Ref. Method C

Run is 10 metres

 

[Bez]

just put this trough some software i use... using in a 20m length.Cable-Mate Version 3.7.5

Cable ID / REF number :

Supply voltage = 230 Volts

Ib - design current = 40 Amps

Protective device type = RCBO type B

In - protective device rating = 40 Amps

Length of run of cable = 20 meters

Power factor = 1

Cable Type : Twin & Earth

Installation Method : Single-core or multicore cable direct in masonry having a thermal resistivity not greater than 2 K.m/W - without added mechanical protection.

method C

Ambient temp = 30

 

[danny7299]

http://jarsoftelectrical.com/sales.aspx

its only

 

[danny7299]

he also updates it about 1 a month , got loads of other things like

Check Disconnection times,

Calculate Zs,

Check your measured R1+R2 values,

Check SWA cable R1+R2 values using the Armour as a CPC,

Calculate conduit and trunking sizes,

Calculate voltdrop,(the software will automatically select a bigger cable if the voltdrop is too high)

Find SWA cleat and gland sizes,

Find maximum clipping distances,

Calculate the minimum cable bend radius,

Calculate conduit and trunking support distances,

Basic lighting design calculations,

Calculate Diversity, (beta version,still being developed)

Shows the minimum Earth CPC for the calculated cable size,

Motor calculations with fuse/MCB selector

 

[Evans Electric]

It'll be fine , don't worry about it.

Deke

 

[tom1]

is the cooker coming just under 10 amps

 

[PC Electrics]

Only caveat I'd add would be to put a label on the CU stating the cable size as 10mm after CCU. And quote 6mm as the cable size on the IEC. Someone else might look at this in the future and think it's 10mm all the way and wack a 50A MCB in.

 

[binky]

Only caveat I'd add would be to put a label on the CU stating the cable size as 10mm after CCU. And quote 6mm as the cable size on the IEC. Someone else might look at this in the future and think it's 10mm all the way and wack a 50A MCB in.

Final connections to cookers vary enormously - its up to them to check, but labelling would be good practice.