I would like to order some wire online but don't know what it's called. Two-conductor shielded copper wire for 24V, insulated so it could be secured with zip-ties to the HX supply and return pipes running between the boiler and the indirect water heater. It connects to the aquastat. What's this kind of wire called?
what is the name/designation for two-conductor insulated shielded copper wire for 24V that runs to the aquastat?
We called it shielded 2 conductor wire ??? gauge or Shielded 2 conductor thermostat wire. The term depends a lot on where you purchase it. Be sure you pay attention to the temperature rating. If the insulation voltage rating is higher, great that is OK.– GilSep 9, 2021 at 21:29
Are you in the U.S.? Can you please provide a pic with something familiar, like a penny or a pencil or a measuring tape in it for reference?– DASSep 9, 2021 at 22:51
1are you sure that it has to be shielded?– jsotolaSep 10, 2021 at 0:02
@jsotola: Not at all sure, but I figured it couldn't hurt since these wires run under the stereo and speakers in the floor above; those speakers buzz now and then for no apparent reason.– mr blintSep 14, 2021 at 12:35
18/2 or 16/2 shielded CMR will do
One lesser-known thing about the NEC is that type CM (communications) cables with the correct wire gauge and count can be freely used for any application that calls for a type CL2 or CL3 (low voltage control) cable. So, I'd use a shielded two-conductor in-wall audio or security-alarm cable for this -- these are type CM(R), and many of them are of sufficient gauge to handle anything a thermostat cable can.