Low level channeling (sub lvl 30) should be basically impossible.
If it helps? Shock of lightning in pvp all the way up to I'd say lvl 40ish interrupted every single time and should be a good metric for "what is enough push". As you went up from there (channeling skill lvl 40 caster and up), you'd see people able to get a cast through it once in a while (enough that an enemy casting through it would set you back greatly as opposed to casting a lure or otherwise high lvl/damaging spell).
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