I have posted a piece here which is also on the TT topic, but is more general and I think a new thread would be better. Your voice is heard. See below.
Yes Graham, I know that BUT the Manufacturers are trying to say that if the MCBs after an RCD rated at say 63A total more than 63A they are non-compliant. This is a significant issue, in that both the manufacturers' instructions and the type testing results and specification are at odds with one another, and they are saying that the RCD needs protecting at its rated current with a CPD (usually the main fuse). This is because the instructions have been "adjusted" recently to make the fitting of RCBOs mandatory to allow this protection if 100A RCDs are not fitted throughout. In fact, I have not yet got a copy of the instructions, so this is slightly secondhand, but SparkingChip has posted it as such. I await the full evidence if someone would like to post/send me a copy from any of the BEEMA companies CU instructions, which apparently are all identical about this requirement. Effectively it outlaws any kind of diversity in the CU unless final circuits have RCBOs or 100A RCDs, which is not what they actually sell in split "filled" units! The alternative is that the supply cannot have a 100A main fuse, which does not comply with BS EN 61439-3.
Yes Graham, I know that BUT the Manufacturers are trying to say that if the MCBs after an RCD rated at say 63A total more than 63A they are non-compliant. This is a significant issue, in that both the manufacturers' instructions and the type testing results and specification are at odds with one another, and they are saying that the RCD needs protecting at its rated current with a CPD (usually the main fuse). This is because the instructions have been "adjusted" recently to make the fitting of RCBOs mandatory to allow this protection if 100A RCDs are not fitted throughout. In fact, I have not yet got a copy of the instructions, so this is slightly secondhand, but SparkingChip has posted it as such. I await the full evidence if someone would like to post/send me a copy from any of the BEEMA companies CU instructions, which apparently are all identical about this requirement. Effectively it outlaws any kind of diversity in the CU unless final circuits have RCBOs or 100A RCDs, which is not what they actually sell in split "filled" units! The alternative is that the supply cannot have a 100A main fuse, which does not comply with BS EN 61439-3.
