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15 amp vs 20 amp difference?

Been wondering about this for a while, some power conditioners (Shunyata in particular) and other equipment spec. to use a 20 amp power cord. What is the physical difference between the two? Would the plugs for iec and male input be different and not fit into the regular outlets (ie like the Oyaide GXS or PS Audio Ultimate or do they require a different type specifically just for 20 amp usage? I do realize the amp rating (that they'd draw) between the two would be different. Your help would help to further edudate me, Thanks.
rsjm80

Showing 2 responses by jea48

jea48
4,672 posts
 
Shunyata Research equipment is UL/CSA Listed. Beings they use 20 amp receptacles they have to use a 20 amp IEC male connector to get the UL seal of approval.

For some reason a power cord with a 20 amp IEC connector and a 15 amp plug is ok with UL..... That one doesn't make any since to me. By allowing the configuration it is not idiot proof. Nothing prevents a user from plugging loads designed for a 20 amp branch circuit into a 15 amp branch circuit.....
Jim
jea48
4,672 posts
 
For this reason, changing the outlet to a 20A is risky without also changing the wiring from the breaker box to that outlet.
Inline_phil
And that is why NEC says a 20 amp receptacle shall not be installed on a 15 amp branch circuit.....

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