Question regarding IEC-61439-1 2020

Question

Question regarding IEC-61439-1 2020

Anzar97 (Electrical)

(OP)

31 Oct 22 06:40

We currently went to temperature rise testing of our switchgear panel and one of the point on aluminum busbar exceed the limit and saturated to 55.4°C it was only 0.4°C above limit, shall it be considered or we have to do improvements?
and secondly regarding highlighted in Table 6 (attached) of IEC-61439-1 a manufacturer can declare stability of electrical joint otherwise the rise shall taken as 55°C of aluminum bus, so if manufacturer declares other temperature rise limit as the joint shall not go bad on a little bit higher temperature other than mentioned in standard, so will it be considered?

Gr8blu (Electrical) · Answer 1 · 2022-10-31 15:20:48

Anzar: First - does your application meet ALL the OTHER requirements listed in that table (like max 35 C ambient)? Second - there is no wiggle room since the description says "no documentation from manufacturer means MAX 55 C". If using manufacturer document, it typically has to specify which joint(s) it expects to be hottest, and why the joint is acceptable. It also has to specify the conditions under which the manufacturer conducted the testing: so if they said "65 C rise okay when we tested it at 20 C ambient", and you're operating at 35 C ambient, you'd still be stuck with a max 55 C allowable rise condition.

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Question regarding IEC-61439-1 2020