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c. Wiring Diagram
Flexible metal conduit or flexible metallic tubing
shall be permitted for grounding if all the following
conditions are met:
The length in any ground return path does not
exceed 6 feet.
The circuit conductors contained therein are protected
by overcurrent devices rated at 20 amperes or less.
The conduit or tubing is terminated in fittings approved
for grounding.
For complete grounding details and all allowable exceptions,
refer to the current edition of the NEC- National Electrical Code
NFPA 70.
4. Astandard 1/2" conduit opening has been made in the water
heater junction box for the conduit connection.
5. Wiring Diagrams (see Wiring Diagrams section) have been
supplied showing the two most common types of connections
between the water heater and the power supply. You can
easily see which type connection you have by removing the
junction box cover on top of the water heater.
• Two Wire Connection Diagrams: is the most common
requiring you to simply connect red to red, black to
black, and the ground wire to the green ground screw
in the junction box of the water heater.
• Three Wire Connection Diagram: is used when you
are connecting the water heater to a power supply
that has a "Time Clock" or "Off Peak" meter. To make
these connections refer to block 1 or 2 in this wiring
diagram for the type of system you have.
NOTE: If you have purchased a three wire connection water
heater but you are not on a "Time Clock" or "Off Peak" meter
and have a standard two wire connection power supply,
simply follow the connection diagram in block 3 of the three
wire connection diagram.
6. Use wire nuts and connect the power supply wiring to the
wires inside the water heater's junction box.
7. The water heater must be electrically "grounded" by the
installer. A green ground screw has been provided on the
water heater's junction box. Connect ground wire to this
location.
8. Replace the wiring junction cover using the screw provided.
CONDUIT
GREEN
GROUND
SCREW
FIGURE 23.
• Before removing any access
panels or servicing the water
heater, make sure the electrical
supply to the water heater is
turned "OFF".
• Failure to do this could result in
death, serious bodily injury, or
property damage.
STANDARD WIRING FOR 2 WIRE LEAD WATER
HEATERS 240 VOLT SINGLE ELEMENT
TO ELECTRIC
POWER SUPPLY
o
,J
m
BLACK
RE
1 _ 3
@
o
_0 4 ,,,
pTO_120480VAC2_220_72_0AVcAC
JUNCTION
BOX
"__HEAT LOWER
ING ELEMENT
FIGURE 24.
13