The connectors are definitely distinct and incompatible, you won't be able to force a 20 into a 30 or vice versa.
So yes, one of the ends has been changed. M. Original Message From: Randy Sent: Tuesday, March 18, 2014 18:42 To: nanog@nanog.org Reply To: a...@djlab.com Subject: L6-20P -> L6-30R I have a situation where a 208v/20A PDU (L6-20P) is supposedly hooked to a 208v/30A circuit (L6-30R). Before I order the correct PDU's and whip cords...sanity check...are connectors 'similar' enough that this is possible (with force) or am I going to find we've actually got L6-20R's on the provider side? -- ~Randy
