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Name the breaker. (Dorman Smith BS3871 Type D).

Sparkingchip

I an trying to determine the maximum Zs for the spare 16 amp MCB with a 5 second disconnect time. 

The maximum Zs of the SWA distribution circuit will be less than 1.4 ohms using a third core as the CPC not including the armour, so it will be lower.

Edit- taking Ze as 0.8 ohms TNS.

professional-electrician.com/.../

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    It's in a flat above commercial premises and I guess the same electricians wired the whole building,  note the lights are on a 16 amp MCB which is not to be expected in a flat.

    I need to add a 30 mA RCD, but I want to do it at the other end of the circuit in a garage consumer unit where I can ensure it is accessible to a wheelchair user, not high up in a wall in a cupboard. The highest rated MCB in the CU it will supply will also be 16 amps, so I'm not completely relying on this old device. 

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    It's in a flat above commercial premises and I guess the same electricians wired the whole building,  note the lights are on a 16 amp MCB which is not to be expected in a flat.

    I need to add a 30 mA RCD, but I want to do it at the other end of the circuit in a garage consumer unit where I can ensure it is accessible to a wheelchair user, not high up in a wall in a cupboard. The highest rated MCB in the CU it will supply will also be 16 amps, so I'm not completely relying on this old device. 

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