Each cap will become charged to about 350Vdc. The diodes will then see about 700Vdc peak reverse voltage. You need a sensible margin on top of that, so consider 1000V a sensible minimum.

Short answer – no.

Murray

1N4007 diodes are rated at 1000v if memory serves me correctly.

If you need a higher current 1N5408 is rated at 1Kv 3A

Best to use proper bridge rectifier diodes if at all possible. They are generally quite slow, which isn't a problem at 50Hz, but also tend to be relatively large lumps of silicon. That's necessary in order to withstand the surge currents typically encountered with large bus caps and mains transients.

Bear in mind that you can expect some pretty large surge currents depending on the instantaneous voltage when you connect the mains via the power switch.So although you may only expect an average current of an amp or so, your diodes should be rated for non-repetitive surge currents of perhaps 10-20 times that. If you are in doubt or don't have suitable diodes, it may be worth getting a 1000V bridge diode. They only cost a few quid from CPC.

Murray