Question: how many amps can knob and tube handle?
Answer: Knob and tube wiring is often #12 gage copper wire and can handle 20 amps. Note: Even though some knob and tube wiring is capable of handling 20 amps, we suggest that it be protected by 15 amp fuses because, in all likelihood, some modern #14 gage wire may be connected to the older #12 gage wiring.