Bosch HBL54, Installation Manual

English 7

7. Continue with the unit installation in the following 

sections on electrical connection and installing the 
oven unit into the wall cabinet.

Connecting the Microwave Oven or Steam 
Oven Electrical Conduit to the Single Oven  

Note: 

If installing the oven with a microwave or steam oven 

mounted as a combination unit, the microwave oven or 
steam oven power cable must be properly attached to the 
oven-mounted junction box. This must be done prior to 
supplying electric power to the oven unit.

1. Check to be sure there is no electric power supplied to 

the oven.

2. Remove the oven mounted junction box cover (located 

on the rear top of the oven).

3. Remove the cap from the conduit access hole in the 

side of the oven mounted junction box.

4. Guide the four wires from the conduit cable coming 

from the microwave or steam oven through the hole in 
the oven mounted junction box.

5. Snap the conduit connector into the hole by pressing it 

in until it clicks into place.

6. Follow the wiring diagram label and match and connect 

each wire by color to the wires attached to the wiring 
block inside the oven mounted junction box. Push the 
bare end of the wire until it is snug in the wiring block 
then tighten down the retaining screw on each wire. 
Tighten securely, but do not over tighten.

7. Replace the oven mounted junction box cover and 

tighten the two screws holding it in place. Tighten the 
screws securely, but do not over tighten.

8. Refer to the Electrical Connection section for further 

information to complete the electrical connection of the 
combination unit to the main power supply.

Electrical Installation

All model ovens on the front cover of this installation 
instruction manual are dual rated, designed to be 
connected to either 208 or 240V AC, 60 Hz, 4 wire, single-
phase power supply.

The electrical supply should be a 4-wire single-phase AC. 
Install a suitable conduit box (not furnished). An 
appropriately-sized, UL-listed conduit connector must be 
used to correctly attach the conduit to the junction box.

Important: 

Local Codes may vary; installation, electrical 

connections and grounding must comply with all applicable 
local codes.

If local codes permit grounding through the electrical 
supply neutral, connect both the white neutral wire and the 
green ground wire from the oven to the white neutral 
electrical supply wire.

Important: 

If you have purchased a combination oven unit 

(one that includes a microwave or steam oven over the 
single oven), see the preceding section “Connecting the 
Microwave Oven or Steam Oven Electrical Conduit to the 
Single Oven” showing electrical connection of the 
combination unit components. 

9

WARNING

Disconnect the oven from the electric power supply 
before connecting the microwave oven or steam 
oven wiring. Failure to do so could result in electrical 
shock and injury or death.

Model

Circuit Required

208V, 60 Hz

240V, 60 Hz

HBN54, HBN84, 
HBL53, HBL54, 
HBL84, HBLP4

30 AMP

HBL55

30 AMP

40 AMP

HBN56, HBL56, 
HBL57, HBN86, 
HBL86, HBL87,
HBLP6, HBLP7, 
HSLP7

40 AMP

9

WARNING

Complete the connection of the microwave or steam 
oven conduit to the single oven before proceeding 
with the unit electrical connection to the main power 
supply.