On Fri, 2 Jun 2017 20:36:11 -0000 (UTC), Boris
wrote:



Because it's not the standard 6' install, and it may overheat. I say
they don't know what they are talking about. If the cord is same gauge
as home 30 amp circuit, fine.

Overheating is not an issue at all. The heat distribution from voltage
drop will be exactly as it would be with a 3 foot cord and in a 10ga
wire that is negligible anyway. Dryers only pull about 21-22a.


Some cite newer code,


The only code would apply to the part in the wall. If a 3 wire
receptacle was installed per the 1996 or earlier code it is perfectly
legal to use.
If you are in Chicago, there may be a 6' limit to any cord tho. That
is just Chicago tho.