IanP
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Instead of "cascading" relays you may consider solid state relay (SSR) ..
Not only they provide full isolation between control circuit and load, but they can be driven directly from TTL/CMOS pins ( ) ..
You can build them of discrete components (Optocoupler, Triac ...) or you can buy them off-the -shelf, as one-, or three-phase devices ..
https://www.futurlec.com/RelSS.shtml
Regards,
IanP
Not only they provide full isolation between control circuit and load, but they can be driven directly from TTL/CMOS pins ( ) ..
You can build them of discrete components (Optocoupler, Triac ...) or you can buy them off-the -shelf, as one-, or three-phase devices ..
https://www.futurlec.com/RelSS.shtml
Regards,
IanP