By CSA on 24 January, 2013 - 7:35 pm. Triad cable is three wires (conductors; cores) that are twisted and shielded, usually in a plastic cover/jacket. A triad would only provide you with three wires/conductors/cores, and a properly-applied 4-wire RTD requires 4 (four) wires/conductors/cores. You could use two (2) two-wire (conductors; cores) twisted, shielded pair cables for a total of four wires/conductors/cores--which is what should be used for a 4-wire RTD.
The solution for crusty scalp is to purify the root and scalp and help to ph balance the skin on the scalp. This allows the natural zinc barrier in the scalp to act as it should to ward off any bacteria.
1 Baking soda is also great for treating a dry scalp, dandruff, fungus on the scalp and makes a great clarifying shampoo. Just mix 1 tablespoon with enough water to make a paste and then use for your normal shampoo.  Forget a dermatologist, go to a trichologist. They specialize in hair and scalp care.