"Penetrations through fire-rated partitions:"

From: Bill Butler

As an electrician in a hospital, I often need to run conduits through fire-rated walls. Since the gap around the conduit must be as small as possible, I use a saw made from a short length of conduit that has saw teeth cut into it.
They do not have to be perfect. I have a set of three (1/2", 3/4" and 1" sizes) that fit inside one another for storage. To use, simply determine where the conduit is to go through the wall, place the "saw" at that point, tap
lightly to start the teeth, then twist the conduit to cut the hole. The advantage of doing it this way is that the opposite side of the wall does not "blow out" as it would by driving a hole and also the holes are perfectly
aligned with each other since the conduit is the same diameter as the saw. Very little firestopping compound is required by this method.

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