John, You are correct in that few pipes are sealed by anything other than the
junction box. When sealing is called for a foam sealer is usually specified.
The only exception I can think of off-hand is in rigid pipe in explosive
locations such as gas stations where a product called Chico is used. Don't
quote me on the name as it's been 30 years since I wired a gas station. Hi I
used the foam sealer in a highly methane location which was an amphitheater
built over an old city dump in Mountain View Ca. Maybe Canada has different
code requirements but I seriously doubt it. Besides, duct seal would make a
poor pipe seal. Russ K5ZZR My Heroes Wear Combat Boots!
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