American Dryer Corp. AD/ML-310 - Manual (Page 29)

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3. Electrical Connections
NOTE: A wiring diagram is included with each dryer and is located in the blueprint pocket inside the
left side control cabinet.
The main electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, and L3), GROUND,
and in the case of 4 wire service, the Neutral. The electrical connections are made at the power distribution block
located in the base front electrical enclosure.
The main electrical (3-phase [3ø]) connections (L1, L2, and L3) must be provided and installed in accordance
with state and local codes. In the absence of these codes, grounding must conform to applicable requirements of
the National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the installation must conform
to applicable Canadian Standards: Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION
(for Electrical Connections).
NOTE: A CIRCUIT SERVICING EACH DRYER MUST BE PROVIDED.
4. Main Grounding
A ground (earth) connection must be provided and installed in accordance with state and local codes. In the
absence of these codes, grounding must conform to applicable requirements of the National Electrical Code
ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the installation must conform to applicable Canada
Standards: Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION. The ground connection
may be to a proven earth ground at the location service panel.
NOTE: A grounding connection (terminal lug) is provided in the dryer in the base electrical junction
box.
For added personal safety, when possible, it is suggested that a separate ground wire (no. 18 minimum) be connected
from the ground connection of the dryer to a grounded cold water pipe. DO NOT ground to a gas pipe or hot
water pipe. The grounded cold water pipe must have metal-to-metal connection ALL the way to the electrical
ground. If there are any nonmetallic interruptions, such as, a meter, pump, plastic, rubber, or other insulating
connectors, they must be jumped out with no. 4 copper wire and securely clamped to bare metal at both ends.
IMPORTANT: For personal safety and proper operation, the dryer must be grounded. For proper
operation of the microprocessor controller (computer), an earth (zero) ground is
required.
NOTE: Grounding via metallic electrical conduit (pipe) is not recommended.