help with cable calculations please

[jonnyspeed]

hey everyone. could someone please help me answer this question? i need to become more familiar with knowing how to search through the bs7671 for the information i need. Basicaly if someone could answer this and explain in lamens terms what pages and tables i need to look at while solving this problem.. plzz

Cable calculations

A

Installation is a shower rated at 8.5Kw, it is to be installed using 70

 

[ianmacd]

I would look for the answers in the OSG and refer back to the BRB (as the OSG has reference numbers against it) for specific wording if needed. Once you have done that a few times you (hopefully) will start seeing a pattern with the sections needed for these.

 

[jl-heating]

Cable-Mate Version 3.3.0

Cable ID / REF number :

Supply voltage = 230 Volts

Ib - design current = 37 Amps

Protective device type = BS3036

In - protective device rating = 45 Amps

Length of run of cable = 50 meters

Power factor = 1

Cable Type : General purpose PVC - Singlecore

Installation Method : Single-core or Multi-core cables Fixed on (clipped direct), or spaced < 0.3 x cable diameter from a wooden or masonary wall

method C

Ambient temp = 30

 

[jl-heating]

i use software for any cable runs .. also give customers a copy with certification etc ..

they love it .

 

[spinlondon]

Section 701 will provide the requisit Regulation for RCD protection.

 

[ianmacd]

Cable-Mate Version 3.3.0Cable ID / REF number :

Supply voltage = 230 Volts

Ib - design current = 37 Amps

Protective device type = BS3036

In - protective device rating = 45 Amps

Length of run of cable = 50 meters

Power factor = 1

Cable Type : General purpose PVC - Singlecore

Installation Method : Single-core or Multi-core cables Fixed on (clipped direct), or spaced < 0.3 x cable diameter from a wooden or masonary wall

method C

Ambient temp = 30

 

[jonnyspeed]

thanks for that.was really helpful. all i need to do is practice i guess. how about this one...

B

You have been asked to suggest a conductor size to BS7671 2008 for a supply to a small domestic annex, the circuits are

1 x cooker total load 5Kw with a socket on the cooker switch

1 x water heater load 3Kw

1 x immersion heater 3Kw

2 x 6A lighting circuit

2 x 32A RFC

The cable will be a PVC/SWA connected to a type

 

[ianmacd]

Depth of the insulation?

 

[jonnyspeed]

not sure. my course tutor gave me these questions. say 1 metre..

 

[m4tty]

sorry to cut in on your thread jonnyspeed but JL what software are you using?

Cheers

 

[ianmacd]

sorry to cut in on your thread jonnyspeed but JL what software are you using? Cheers

Its cable mate by the looks of it: http://jarsoftelectrical.com/cablemate.aspx

 

[dannybunes]

hey everyone. could someone please help me answer this question? i need to become more familiar with knowing how to search through the bs7671 for the information i need. Basicaly if someone could answer this and explain in lamens terms what pages and tables i need to look at while solving this problem.. plzzCable calculations

A

Installation is a shower rated at 8.5Kw, it is to be installed using 70

 

[steptoe]

Its cable mate by the looks of it: http://jarsoftelectrical.com/cablemate.aspx

have you read the bit on the website where it says you have to do the calcs yourself to make sure it is correct.? :|

 

[ianmacd]

have you read the bit on the website where it says you have to do the calcs yourself to make sure it is correct.? :|

Was thinking of a web based one and maybe calling it cable bud or wire friend or something like that but it may turn into facebook for disfunctional sparks. Oh wait that's here.

Only joking (not about the web site though)

 

[revjames]

Was thinking of a web based one and maybe calling it cable bud or wire friend or something like that but it may turn into facebook for disfunctional sparks. Oh wait that's here.Only joking (not about the web site though)

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