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Wiring
ELECTRIC SHOCK HAZARD. Disconnect all
power before installing or servicing heater.
Failure to do so could result in personal injury
or property damage. Heater must be installed
by a qualified person in accordance with the
National Electrical Code, NFPA 70.
ELECTRIC SHOCK HAZARD. Any installation
involving electric heaters must be performed
by a qualified person and must be effective-
ly grounded in accordance with the National
Electrical Code to eliminate shock hazard.
1. Electrical connection to the Radiant Heater is made
through two openings tapped for 1/2" connec-
tor. Openings are in the top of the extruded heater
housing, one near each end.
2. Wiring should be run in flexible or rigid metal con-
duit and must be installed in accordance with the
requirements of the National Electrical Code and
such other local requirements as may be applica-
ble. NOTE: High temperatures will oxidize copper.
Do not use copper wire in connecting this heater.
Stranded, insulated, nickel-plated copper wire is
recommended.
3. Access to Radiant Heater terminals is obtained by
removing the two screws in each of the terminal box
covers.
4. A sufficient length of this wire (not Jess than 12")
should be used to extend from each heater terminal
into a connection box location where the tempera-
ture does not exceed 300°F.
5. Leave generous loop in wire when connecting to al-
low for expansion of heating element.
6. Assemble terminal, nut and wire as shown in Fig. 5.
Figure 5
7. Tighten the terminal nut securely with a wrench.
NOTE: Where circuit wiring is installed in locations
of high ambient temperature, conductors should be
insulated in accordance with requirements for tem-
perature and voltage.
8. SINGLE END WIRING may be made through one
of the wiring entries by bringing a lead through it
from the opposite end of the heating element us-
ing the wire-way provided behind integral reflector
in the housing extrusion. Wire used in making such
connections must be able to operate in high ambi-
ent and have a sufficiently high voltage rating for the
specific application. The maximum wire diameter is
limited by the wire-way and must not exceed .224"
over the insulation.
9. DELTA CONNECTIONS - When heaters occur in
multiples of three, they may be connected to, and
balanced across, three-phase lines. The most com-
monly used connection is the delta connection il-
lustrated in Figure 6.
A
B
C
D
E
3 Conductors
in 1 Conduit
Three phase Delta connections to minimize inductive
effect in conduits are made per this diagram. The rule:
run all 3 three-phase conductors in the same conduit
as far as possible. For single-phase, run only two con-
ductors and follow the same rule.
4
3 Conductors
in 1 Conduit
Radiant
F
Heaters
L1
L2
L3
Figure 6
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