One way to test if 230V mains is getting to the trip switches is to simply press the 'Test' button on an RCD. It should trip immediately. If it doesn't, then either the RCD has failed (very unlikely but possible) or there is no 230V getting to it. Maybe the RCD on the hookup post or house supply has tripped.
Edit: MichaelT types faster...
Edit: MichaelT types faster...