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 If your skin is too sensitive, dilute tea tree oil with some baby shampoo. Add 10-20 drops of tea tree oil to 1/2 cup of baby shampoo. Use this daily to wash your scalp and hair till you get rid of itchy scalp.  You can even massage diluted tea tree oil to your scalp.