/lib/udev/rules.d/52-nut-ipmipsu.rules is in nut-ipmi 2.7.4-5.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # This file is generated and installed by the Network UPS Tools package.
# It sets the correct device permissions for nut-ipmipsu driver.
KERNEL=="ipmi*", MODE="664", GROUP="nut"
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