TIL the average pull box has a max fill ratio of 40%, guess who learned the hard way

I mean I always knew you weren't supposed to stuff a pull box like a turkey, but I never actually looked up the number. Last month we had a service call over on Maple Ave where a guy had crammed like 14 cables into a 12x12 box and it was shorting out every time it rained. When I pulled up the spec sheet on my phone, it said 40% fill max, and I've been doing this for 8 years without ever checking. How do you guys actually plan fill ratios on tight jobs, or do you just eyeball it and hope for the best?

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