Middleby Marshall PS740E Installation Manual download pdf (Page 21)

17 P/N60254September28,2012

III. ELECTRICAL CONNECTION INFORMATION

FOR PS740E-SERIES OVENS.

WARNING

Authorized supplier personnel normally

accomplish the connections for the ventilation

system, electric supply, as arranged by the

customer. Following these connections, the

factory-authorized installer can perform the

initial startup of the oven.

Check the oven data plate (Figure 2-17) before making any

electric supply connections. Electric supply connections must

agree with data on the oven data plate.

NOTE: The electric supply installation must satisfy the require-

ments of the appropriate statutory authority, such as the National

Electrical Code (NEC), ANSI/NFPA70, (U.S.A.); the Canadian

Electrical Code, CSA C22.2; the Australian Code AG601; or

other applicable regulations.

A fused disconnect switch or a main circuit breaker (customer

furnished) MUST be installed in the electric supply line for

each oven; it is recommended that this switch/ circuit breaker

have lockout/tagout capability. The electric supply connection

must meet all national and local electrical code requirements.

Copper is the recommended material for the electrical supply

conductors.

Figure 2-17. Typical Electric Oven Data Plate

IV. ELECTRIC SUPPLY FOR ELECTRICALLY

HEATED OVENS

Power requirements for electrically heated ovens are usually

208 - 240VAC, 3-phase, 4-wire (3 ‘hot’, 1 ground), although

ovens built for export can have power requirements of 380VAC

and 480VAC. (These ovens have a 5-wire system.) A 2″ (51mm)

diameter cutout/hole in the back of the machinery compartment

provides access for the electrical supply connections. Using

exible cable(s) for the electrical power supply conductors

requires a 2″ (51mm) strain-relief tting (not furnished) to en-

able safe access to the terminal block from which oven power

is distributed.

The supply conductors must be of the size and material (cop-

per) recommended to provide the current required; (refer to the

data plate for the ampere specications). The electric current

rating for each conductor supplying a PS740E-Series Oven

must comply to local and national codes.

Typical specifications for each PS740E-Series Oven

are 208V or 240V, 3-phase, 4-wire, 60-ampere, 34.4kW. A

PS740E-Series Double Oven (Figure 1-2) installation would

require two 60-ampere service connections, one for each

oven; the 34.4kW power consumption also doubles for such

an installation to 68.8kW.

The 208V or 240VAC electrically heated oven uses two legs

of the supplied power to provide 208V or 240VAC power for

the oven control circuitry.

Electrical Junction Box

(One per oven cavity)

Figure 2-18. Utility Connection Locations for Elec-

tric Ovens

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