RE: Want to move to all 208V for server racks

[John van Oppen <jvanoppen () spectrumnet us>]

GFCI breakers are very common, the slightly less common version are arc fault breakers which are starting to show up 
more as well.

GFCI breakers are often required on large services, most large (new) 480v services I have seen (1000A and larger) a 
have Ground fault breakers, in fact I have seen some bad outages on entire datacenters where the main breakers had a 
lower ground-fault current setting (for tripping) than a branch circuit that had a phase-to-ground fault resulting in 
the main breakers tripping instead of the branch circuit.   I don't know if the ground-fault breakers are required just 
in Washington (I am in seattle) or if it is a NEC requirement.

John

-----Original Message-----
From: Chris Adams [mailto:cmadams () hiwaay net] 
Sent: Thursday, December 02, 2010 7:38 PM
To: NANOG list
Subject: Re: Want to move to all 208V for server racks

Once upon a time, Ricky Beam <jfbeam () gmail com> said:
> Just because someone is selling them doesn't mean they meet building 
> codes. (esp. for residential use.)  None of the dozen or so licensed 
> electricians I've ever talked to will use them.

I saw GFCI breakers installed in a new house this year, and it passed inspection.

I think you experienced a recall of a specific device and are confusing that with a general removal.  When Toyota 
recalled a model of car, that didn't mean all cars were banned.
--
Chris Adams <cmadams () hiwaay net>
Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough 
trouble.