D Type MCB's

[Spock]

Can someone confirm please - I don't think this will make any difference but - would the replacement of a B Type breaker for a D Type have any effect on whether a compressor/motor start-up dimmed the lights in an installation? (assuming that both MCB's were able to cope with the current demands)
Thanks

 

[telectrix]

don't see it can make a scrap of difference asa the volt drop on start up would not be affected whatever MCB you fitted.

 

[topquark]

You are correct, no difference.

 

[topquark]

don't see it can make a scrap of difference asa the volt drop on start up would not be affected whatever MCB you fitted.

He's back, and his fingers are quicker than ever

 

[GLENNSPARK]

Can someone confirm please - I don't think this will make any difference but - would the replacement of a B Type breaker for a D Type have any effect on whether a compressor/motor start-up dimmed the lights in an installation? (assuming that both MCB's were able to cope with the current demands)
Thanks

But your Zs certainly would....

 

[Silly Sausage]

He's back, and his fingers are quicker than ever

You've only just noticed?!?

 

[topquark]

You've only just noticed?!?

Only just noticed the finger speed, coz he beat me to it

 

[johnboy6083]

agree with glennspark. changing from a b type to a d type, will mean that the MCB will require 20x In to disconnect instaneously. This means that your Zs values need to be a lot lower in order to alow for this.

Zs= Ipf/Uo

 

[Risteard]

20 times for a Type D, isn't it?

3-5 for B, 5-10 for C and 10-20 for D.

 

[telectrix]

20 times for a Type D, isn't it?

3-5 for B, 5-10 for C and 10-20 for D.

20x In for type D. well spotted, that man.

 

[telectrix]

He's back, and his fingers are quicker than ever

after seeing some of the electrics in turkey, the bad things we see posted on this forum are minor imperfections.

 

[johnboy6083]

actually fellas, bsen60898 allows for upto 50x on a type d. but most type d's are 20x. i stand corrected.

 

[ipf]

But your Zs certainly would....

What's Zs (or maximum allowed) got to do with dimming lights on start up?

 

[topquark]

What's Zs (or maximum allowed) got to do with dimming lights on start up?

Nothing, he's just making the point that the circuit may no longer comply if it is changed.

 

[telectrix]

What's Zs (or maximum allowed) got to do with dimming lights on start up?

nothing at all, was just an observation that the max. Zs would decrease id a type d were to be fitted. and be4 you say it, neither did my post about turkey have anything to do with it, except that the lights thewre are always dim. a bit like me after as skinfull