Thermolec Application &Technical Notes - Manual (Page 23)

STEP 2 - (continued)
Nema 4 or Weatherproof control Box
NEMA 4 or Weatherproof
oversized control panel
Insulated Terminal Box
When there is a risk of condensation
because of a high contrast between the duct
temperature and the control box temperature,
Thermolec recommends an insulated control
box.
Recess Terminal Box
When heaters are installed in insulated ducts
with more than 1” insulation or are inserted
through an accoustic plenum, specify a recessed
terminal box and indicate dimension of cold
section.
Recessed Terminal Box
THREE EASY STEPS
In locations subject to frequent washdowns (i.e.
mines, food processing plants), the electric heaters
must be supplied with a NEMA 4 control box. The
terminal box is all welded, painted steel, with a
hinged, gasketed cover and hold-down clamps.
When required, the terminal box could be made in
stainless steel (specify Nema 4X). The electrical
contractor must install water-tight connectors for
power supply and control wires.
Insulated Terminal Box