You think it was required by the local AHJ in this one supermarket?
Within the grocery industry it is normal for the chain to purchase all of the major equipment and light fixtures directly from the manufacturer.
Once the inspector started to kick the grocer used its buying power to have a sheet metal firm bang out a solution pronto.
Each day of delay costs the grocer about $20,000 in lost gross profit.
With such economics they'd rather fix than fight, and they'd want it fixed overnight.
One new grocery store made the painters so happy: three different color schemes applied over 96 hours round the clock to satisfy the CEO.
I saw a theater change its color scheme three times in three days. But delay the opening: no way.
Bob:
Only place I remember anything like this.....Jersey City, NJ
Jersey Journal Newspaper offit (then). One service in basement, actually under sidwwalk, had a 4" drip pan over top of all the gear. Drain pipes down to sump pumps.
John