SSE 3-Phase Upgrade Gone Wrong! Electrical Advice

SSE 3-Phase Upgrade Gone Wrong! Discussion ThreadSSE 3-Phase Upgrade Gone Wrong! Electrical Advice

Hello,

Looking for some advice following a botched 3 phase upgrade today. Some background:

• Commercial unit originally fitted out (4 years ago) with single phase main supply feeding into 3 phase DB. 2nd DB run off breaker to service single phase requirements (small kitchenette, lighting, sockets, shutter door motor)
• Electrician has prepped site with new 3 phase requirements, mostly just 1st fixed. New 3 phase main switch with consumer side terminated as requested by SEE. Cables clearly labelled.
• SSE (team 1) have brought new 3 phase supply cable into building and terminated into new main fuse cutout.
• SSE (team 2) turn up later in the afternoon to install new 3 phase meter and do final connections between main fuse and main switch. The engineer incorrectly terminated into the main switch and has connected L1-N, L2-L1, L3-L2, N-L3. Main switch was turned on by SSE energising the DB's.
• The main DB had a supply to a compressor which turned on and then tripped the circuit breaker after approx 30s which after a phone call prompted the engineer to realise his mistake and come back to correct it. The compressor was tested after and does appear to be working ok but unsure of any unseen damage.
• The 2nd single phase DB was energised with a PC, monitor, fridge and shutter, lighting all connected. Everything seems to be fine except the roller shutter motor (single phase) that now does not work at all. Again unsure of any unseen damage with the DB, cables or other equipment. The system was energised for 3-4 hours before the fault was noticed.
• A senior engineer visited site this evening after we reported the issue. They were only there to verify the connections were now correct and did not want to engage in any conversation on the consequences of the initial error.

See pic attached that I took of the incorrect termination for reference.

So where I am looking for some guidance is on what potential issues could have been created by the error that...

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