[AusNOG] Fwd: Derating of PDU

[Tony de Francesco]

Could it be a UL rating issue?

UL rating for electrical components is very different to IEC and AS/NZS.

Tony

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From: AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Alex Samad <alex at samad.com.au>
Sent: Tuesday, April 8, 2025 4:48:41 pm
To: Ausnog <ausnog at lists.ausnog.net>
Subject: [AusNOG] Fwd: Derating of PDU

Hi

I'm having the pleasure of looking at PDU's and trying to standardise over US / UK / Japan / Aus

Something I didn't know was the standard in the US for derating electrical devices. whilst I normally plan for max normal draw of around 80% of rating. seems like PDU for USA have a derating value.

So I am seeing 30amp @ 230v in and line rating of 24amp and max 30amp.  The notes seems to suggest you can go over 24 amps but only for a very short period of time - seems like minutes.

This seems a bit of a pain for me - whilst I wouldn't normally run over the 24 amps there have been times i have had to run over - but under 30 for days if not a couple of weeks.

Currently I'm trying to order into japan (omg), lot of their stuff is imported which means it comes with the USA specs.  so 24/30 amp setup.. Interestingly also noted that when you read the fine prints its actually 2 x 20amp breakers - 1 breaker per bank .. PDU has 2 banks

I can't find anything about derating for Aus - do we not do it in Aus or mandate it ?


Alex

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