Use metal clad mc with a metal sheath specifically listed as impervious to water or underground feeder branch circuit cable uf either by itself or in a conduit system approved for use in wet locations if you desire additional.
Armoured cable junction box.
Step 1 prepare junction box.
When installing armored cable you should place support straps every 24 inches or so to ensure that the weight of the cable is completely supported.
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You should also place a support strap within about 12 inches.
Insert the screw driver in the crevice and then use it to pry open the knockout tab.
Using your fingers worked the knockout tab back and forth until it simply snaps off from the junction box.
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Use a screwdriver to punch out one of the knockout tabs on the junction box where the armored cable will be installed.
Long runs of armored cable can be quite heavy and cause stress on the connector between the cable and the junction box if not supported.
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The national electrical code prohibits use of bx technically named armored cable ac in wet locations.