Global IR testing on RCBO populated CU

[pc1966]

This should be clearer:

Well that clearly shows the thermal/magnetic element (square & curve zig-zag bit) is only in the line path.

 

[nicebutdim]

Crabtree single module

 

[Mike Johnson]

I thought that was what the ----- meant. ?

 

[pc1966]

The ----- always trip me!

 

[pc1966]

Crabtree single module

That shows the trip part as the 'X' crossing the live path just after the switch symbol.

I think it is often seen that a MCB/MCCB is shown just as an X on power schematics.

 

[nicebutdim]

That shows the trip part as the 'X' crossing the live path just after the switch symbol.

I think it is often seen that a MCB/MCCB is shown just as an X on power schematics.

What are the practical differences between the two schematics? I don't fully understand either, but this is a great alternative to painting the kitchen.

 

[Mike Johnson]

No ----- on this image:

 

[pc1966]

What are the practical differences between the two schematics? I don't fully understand either, but this is a great alternative to painting the kitchen.

I think it is just one of conventions.

Originally schematic parts would show things representative and easy for humans to draw, like coils for inductance. Then CAD and pen-plotters came along and they were simplified to boxes to make it ease for machines to draw.

 

[pc1966]

No ----- on this image:

So RCCB really means "residual current, concealed -----"?

 

[LastManOnline]

Is a neutral busbar worth the additional space required for 2 module RCBOs?

That is a fair point.Often the space is, nt available in older installations. In newer installs space is generally a non-issue. But I can assure from experience that once you install a CU with dual module rcbo, s you will find yourself seeking to "make the space" on your next install. I find installation time is nearly halved. Its a bit like comparing a WAGO push in to a traditional connector. They are also very convenient for testing and for faultfinding.