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Happy Friday Engineers, would anyone be able to share a Short Circuit Calculation - Point to Point Method excel spread sheet? or know of a software that does this via pt. to pt. method?

I have a situation where there is an existing 800a fused switch feeding a new 1200a switchboard with 3 sets of 4#600kcmil + grd. I cant seem to find the code violation for that, any thoughts?

Can anyone clarify and show example of a 3 phase 400A feeder with a reduced size neutral? is that even allowed by NEC?

All, I have a situation and I need to know NEC cite sections of the code. if I have 5 different electrical services can I commingle downstream in a crown box cables/feeders from the different services? see picture attached herewith please help

All, I don't see anything in the NEC code book regarding grounding bonding of manholes, any insight on how to approach this?

I HAVE TWO 480V CONDENSERS FED OFF ONE 60A MCB IS THIS CODE COMPLIANT? (THEY BOTH HAVE DISCONNECTS IN LINE OF SITE) 12 Ton Unit MOP – 40A MCA – 26.4A 14 Ton Unit MOP – 40A MCA – 31.3A

Scenario: 2 rooms one room housing ATS sw's other room housing Transformers and secondary fused disconnects for the ATS conductor protection. Can these Fused discos be in a separate room per NEC?