Hi guys,
another stupid question for you I'm afraid...
Been looking at Appendix 3 of the BGB, protective device trip times etc.
Am I misreading the graphs by thinking that an MCB does not necessarily trip at all in an overcurrent situation?
Take for instance a 32A Type B (Fig 3A4) on a 4mm T+E radial. You could be drawing 40A for the maximum time on the graph (10,000 secs or nearly 3 hours) without tripping. I'm a little confused as to how the MCB is protecting the cable like this (as it's only rated for a maximum of 37A)
Excuse the stupid question, I'm desperately trying to get my head round this stuff!
another stupid question for you I'm afraid...
Been looking at Appendix 3 of the BGB, protective device trip times etc.
Am I misreading the graphs by thinking that an MCB does not necessarily trip at all in an overcurrent situation?
Take for instance a 32A Type B (Fig 3A4) on a 4mm T+E radial. You could be drawing 40A for the maximum time on the graph (10,000 secs or nearly 3 hours) without tripping. I'm a little confused as to how the MCB is protecting the cable like this (as it's only rated for a maximum of 37A)
Excuse the stupid question, I'm desperately trying to get my head round this stuff!
