Watlow Silver Series OIT - Manual (Page 6)

6 Watlow Silver Series OIT Installation Guide
0600-0069-0000 Rev D
- Connect the control panel to earth ground using a copper
grounding rod close to the OIT and control panel.
Hinged doors on control panels do not provide a long-term electrical
connection to the rest of the enclosure. Corrosion develops over time and
prevents good electrical contact. For this reason, a separate wire braid
should be installed from the hinged control panel to the rest of the
enclosure.
Connect OIT Chassis Ground to Control Panel
To reduce the possibility of electrical interference, connect the chassis
ground terminal of the OIT to a clean earth ground. If the control panel
is metal, make sure it is properly grounded. Then connect a short heavy-
gauge wire (#14 AWG) from the chassis ground terminal of the OIT to a
mounting bolt on the control panel door. The mounting bolt must have
good electrical contact to the control panel; scrape away any paint that
may be covering the panel to provide a good connection.
NOTE: If the control panel is made of a non-conductive material, it is
essential that you connect the chassis ground terminal of the OIT to a
clean earth ground point located close to the panel.
Figure 2: Chassis Ground Connection