The ASCE substation structure design manual has its own load factors and combinations which are lower than the ASCE7/IBC. I understand why they are lower but I'm wondering what legal grounds an engineer has to use them since the document is a guide and not a code. We work for an electrical engineer and design the steel support structures and foundations for their substations. We just want to make sure that if there damage from a weather event that we're not drawings additional liability by using the reduced loads. I have tried reading both the IBC and a few state codes as well as the NEC and NESC and it's not clear to me which documents apply to substations.
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