The string behaves differently on Ice than other materials, is more tall and it not conect with other material, only whit ice
Sorry for my english, you can ask me other translation
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Although MC-6540 is a dupe, it goes into more detail. The wiki is wrong, since you can connect wire that is on air to other wires or tripwires as long as the north or east hooks are also above transparent blocks. Upper half slabs and upside-down stairs also count as a non-transparent blocks to the tripwire hooks
"If tripwire is placed on any block with transparency (glass, leaves, signs, air, chests, pistons, glowstone, slabs, stairs etc.), it will not connect to tripwire hooks or tripwire placed on any block that is not glass or leaves."
Quote from the Minecraft Wiki