Cascading RCDs

[Chris15]

Are there any known ill effects of cascading RCDs in series?
The application will be temporary power distribution and it's probably that I'll end up with 2 30mA RCds in line.
I know there won't be any discrimination in a fault and that's cool.

To help picture it, work on the theory that one RCD is switchboard mounted and the other is on a portable distro plugged into that circuit.

[gcpsoundlight]

I dont think you will have an issue, however I AM NOT a qualified electrical enginner, so what I say may not be correct, and cannot be used as sound advice.