On 3/18/2014 6:11 PM, Jay Ashworth wrote:
From: "Randy" <a...@djlab.com>
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?
As it happens, the chart at
http://www.stayonline.com/reference-nema-locking.aspx
suggests that the L6-20 and L6-30 are less different than you'd expect.
I *think* those are on different diameters, and a datacenter employee ought
to friggin' know better... but I don't think it's 100% impossible that this
has happened.
If it did, you're gonna replace the plug anyway...
As long as there's a 20A breaker on the PDU, you're safe, if not within
code.
From experience with some electricians who couldn't follow simple
written instructions, it is physically possible to put an L6-20 plug
into an L6-30 receptacle. But it won't lock into place. Beyond all the
other reasons it's not recommended, the slightest bump of the cable will
likely knock it loose causing whatever is on there to drop. (Cue
electricans knocking the production 6506E's offline 3 times in 20
minutes while they were replacing the breakers and the supposedly
redundant power cords...)
If you can unplug it to look, every one I've ever seen has had the
voltage and amperage clearly molded into the face of it.
Jeremy "TheBrez" Bresley
b...@brezworks.com
