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Home > Archive > Electrical code Compliance > December 2007 > FPE Switchgear with inadequate AIC rating
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FPE Switchgear with inadequate AIC rating
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| This is a hospital where we are connecting a new unit to an existing
emergency panel. The problem is this EM panel has a rating, and the
breaker of 35,000 AIC, it is fed from transfer switch with (65,000
AIC) and the normal feed to this ATS is an 800 Amp - 30,000 AIC switch
in an old FPE switchboard. The utility transformer fault current is
60,000 AIC. The feeder lengths impedance do not drop the current down
to the 30,000 of the first main. Would there still be FPE breakers
available to replace this 800A-30K with 65K or better?
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| hrhofmann@att.net 2007-12-09, 3:25 am |
| On Nov 27, 11:51 pm, TonyN <tony.nara...@gmail.com> wrote:
> This is a hospital where we are connecting a new unit to an existing
> emergency panel. The problem is this EM panel has a rating, and the
> breaker of 35,000 AIC, it is fed from transfer switch with (65,000
> AIC) and the normal feed to this ATS is an 800 Amp - 30,000 AIC switch
> in an old FPE switchboard. The utility transformer fault current is
> 60,000 AIC. The feeder lengths impedance do not drop the current down
> to the 30,000 of the first main. Would there still be FPE breakers
> available to replace this 800A-30K with 65K or better?
This is a serious question worthy of a qualified high-level licensed
electrician, not the opinions of a group of persons who are mainly
interested in electromagnetic compatibility, electrostatic discharge,
lightning transients into electronic equipment, etc.
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| hrhofmann@att.net wrote:
> On Nov 27, 11:51 pm, TonyN <tony.nara...@gmail.com> wrote:
>
> This is a serious question worthy of a qualified high-level licensed
> electrician, not the opinions of a group of persons who are mainly
> interested in electromagnetic compatibility, electrostatic discharge,
> lightning transients into electronic equipment, etc.
Serious indeed. A former employer makes power adapters
for a dialysis machine. A fielded unit had a 'strange'
failure model, so the boss sent the compliance engineer
to the site. The electrical infrastructure was so
fubar'd, that the FDA and local DA office was called.
Electrician may go to jail.
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