Are you referring to those worthless "solderless breadboards?"

They're OK for non-challenging audio-frequency operation and mindless mental masturbation exercises, but it's very difficult to build "real" circuits on them, and even more difficult to build reuseable reproduceable circuits on them. Keep in mind that they have 5 pF of so of capacitance between adjacent contact rows, and, considerable contact resistance. The long wires tend to introduce unwanted inductance, too.

If you plan to run large currents through them, keep a fire-extingusher handy. You're pretty safe, though, as the contacts will not accomodate wires large enough to make sensible use of large currents. If you plan to use high voltages, well, guess again! The boards do come with specifications, BTW. Have you read them?

I've routinely used 24 volts (since they're suitable for litte more than relay-frequency circuits) with no trouble.

If you mean something else, it would be really helpful if you'd be more specific, starting with your defeintion of "standard."

RE