Linking mcb in consumer unit with wire not busbar

[batty]

You haven't seen my work they quite often run away.

 

[Andy™]

it wont run anywhere once its screwed to the wall:coat

your not supposed to put a screw through the cable!

 

[tom1]

[quote name='Andy

 

[ianmacdee]

I disagree as any conductor installed should always be protected by appropriate Fuse size. 6mm as short as this is rated at approx 45 amp but in this case is protected by 60 - 100 amp Main Fuse. the smallest cable to handle 100 amps is 25mm so I would always use busbar links.

 

[Andy™]

BS. you can use overload protection after the smaller cable. try reading 7671, you will find a lot of useful info like that in there

 

[kerching]

BS. you can use overload protection after the smaller cable. try reading 7671, you will find a lot of useful info like that in there

Agreed.    BSn.  !

What about busbar chambers?   300A supply fuse.......do,you Rate ALL outgoing cables at 300A?

 

[bluetobits]

I disagree as any conductor installed should always be protected by appropriate Fuse size. 6mm as short as this is rated at approx 45 amp but in this case is protected by 60 - 100 amp Main Fuse. the smallest cable to handle 100 amps is 25mm so I would always use busbar links.

And you teach? tut tut

 

[Rob_the_rich]

Ian, I think what they are referring to are 433.3.1(ii) and 434.2.1

Although 434.2.1(ii) suggests to me that the single insulated cable should be sheathed (T&E with neutral & cpc removed)

and 434.2.1(iii) suggests it should not be done in plastic CUs

 

[binky]

I disagree as any conductor installed should always be protected by appropriate Fuse size. 6mm as short as this is rated at approx 45 amp but in this case is protected by 60 - 100 amp Main Fuse. the smallest cable to handle 100 amps is 25mm so I would always use busbar links.

The short length of cable will never be exposed to 60-100Amps becuause the 32A MCB will never be drawing more than 32Amp

 

[Tony S]

MissSweden is going to be busy replacing all those 35mm2 concentric service feeds with 185mm2.

 

[Andy™]

just change the substation fuse to 80a

 

[rapparee]

The short length of cable will never be exposed to 60-100Amps becuause the 32A MCB will never be drawing more than 32Amp

^^^That's what i was thinking reading through this thread.

I have done this dozens of times with the small 4way dbs. One RCD and two MCBs one for a light the other for a socket.

 

[Marvo]

Using wire links instead of busbar is pretty much standard practice in many parts of the world. Not unsafe if it's done right. No idea if it's contrary to UK wiring regs though.

 

[Sidewinder]

You can protect a cable at load end against overloaded & supply end against short circuit.

Nothing wrong with that related to BS7671, and, many other standards.

 

[SLIPSHOD & SLAPDASH]

I disagree as any conductor installed should always be protected by appropriate Fuse size. 6mm as short as this is rated at approx 45 amp but in this case is protected by 60 - 100 amp Main Fuse. the smallest cable to handle 100 amps is 25mm so I would always use busbar links.

If this was a problem i think the house would have burnt down by now, the question  was asked over 4 years ago !