Quick question

[mickys86]

Hi guys just wondered what a type b RCD is? Anyone know?

 

[tony mc]

I think this explains it.

Residual-current device - Wikipedia, the free encyclopedia

 

[mickys86]

Cheers I'll have a read

 

[Guest123]

Most commonly found on PV installs, where required, due to their ability to deal with DC fault currents.

 

[mickys86]

Most commonly found on PV installs, where required, due to their ability to deal with DC fault currents.

Thank you. I was only wondering out of curiosity

 

[MarkieSparkie]

The IEC 60755 standard - General requirements for residual current operated protective devices - three types of RCD are defined depending on the characteristics of the fault current.

Type AC: RCD for which tripping is ensured for residual sinusoidal alternating currents

Type A: RCD for which tripping is ensured:
for residual sinusoidal alternating currents
for residual pulsating direct currents
for residual pulsating direct currents superimposed by a smooth direct current of 0.006 A, with or without phase-angle control, independent of the polarity

Type B: RCD for which tripping is ensured:
as for Type A
for residual sinusoidal currents up to 1000 Hz
for residual sinusoidal currents superposed by a pure direct current
for pulsating direct currents superposed by a pure direct current
for residual currents which may result from rectifying circuits