Skutt KilnMaster Kilns Manufactured between 2000 and 2006 - Manual (Page 12)

Electrical requirements for Skutt Automatic Kilns and KilnMaster Controller
Model Volts Amps Watts Copper Wire Fuse or NEMA Receptacle
Size* Breaker Size Configuration
KM-614-3 115 20 2300 10 30 (Canada) 5-30
KM-614-3 115 20 2300 10 30 5-20
KM-714 208-240 20 3600 10 30 14-30
KM-818 240 27.8 6400 8 40 6-50
KM-818 208 26.7 5550 8 40 6-50
KM-818-30A-3 240 21.7 5200 10 30 6-30
KM-818-30A-3 208 24.0 4990 10 30 6-30
KM-1018 240 38.4 9460 6 50 6-50
KM-1018 208 40 8320 6 50 6-50
KM-1027 240 48 11520 6 60 6-50
KM-1027 208 48 9980 6 60 6-50
KM-1027 3ph 240 29.3 11520 8 40 15-50**
KM-1027 3ph 208 31.7 11000 8 40 15-50**
KM-1227 240 48 11520 6 60 6-50
KM-1227 208 48 9980 6 60 6-50
KM-1227 3ph 240 29.3 11520 8 40 15-50**
KM-1227 3ph 208 31.7 11000 8 40 15-50**
KM-1 208-240 Switching Capacity 48 6-50
KM-1 3ph 208-240 Switching Capacity 40 15-50
*For each additional 50 feet use heavier wire, numerically two numbers lower—for example,
instead of #10, use #8. If you anticipate installing any larger kiln in the future, use the heavier wire.
**See special instructions and wiring diagram.
E LECTRICAL R EQUIREMENTS
Most important to proper operation of
your new kiln is to make sure it has
enough of the correct power to operate it.
If this is done, your kiln will give you
years of satisfying service; if not, your first
firing could be disappointing or even dis-
astrous for your kiln.The chart at right
shows the recommended electrical specifi-
cations for each kiln model. If you are
uncertain about your existing outlets, have
them checked by an electrician. If you are
installing a new receptacle, have the elec-
trician follow this guide.
10
A DDITIONAL P OWER N OTES
Three-phase operation. Only special
order Models KM-1027 and KM-1227 will
operate on a three-phase supply.
However, any Skutt kiln can be properly
powered via unbalanced connection to
two of the three hot wires of a three-phase
supply. Of course, the green safety ground
connection provided in all Skutt power
cords is also used.
Three-phase installation.
Three-phase
Models KM-1027 and KM-1227 can be
plugged directly into a three-phase (15-
50R) wall receptacle.
208 versus 240 supplies.
As you can see
from the chart, most Skutt models are
available in either 208 or 240 volt versions.
The exception is Model KM-714 which is
universal, and will fire with 240V or 208V
power.
The “120/208V” supply is increasingly
encountered in schools and newly-built
communities, because it’s more efficient
for heavy 120V loads.
The 208V versions should never be fired
on a 240V supply without first installing a
full set of 240V elements. Otherwise, all
components will be seriously overtaxed.
Conversely, a kiln designed for 240V sup-
ply which is powered on a 208V supply
will be severely underpowered.
5-15 5-20 6-30 14-30 6-50 15-50
Important! Connecting and testing
Model KM-714.
The wall outlets for
Model KM-714 must be powered by 3-
wire 120/240-208V solid neutral supply—
as for an electric range. Only No. 10 wire
is required (or No. 8 for runs over 50 feet).
30 Amp fuses or circuit breakers only—no
larger or smaller—are recommended. The
U-shaped fourth blade of the 4W30 Amp
grounding plug is for the pure green wire
grounding of the kiln case. The blade
opposite this U-shaped one takes the
white solid neutral wire. See the diagram
below and refer to the wiring diagram in
Appendix 5 for the 714 plug diagram.
NEMA R ECEPTACLE G UIDE .