Miele KM 6520 FR Operating And Installation Instructions page 57

Installation
Interim shelf
It is not necessary to fit an interim shelf
underneath the hob but one may be
fitted if you wish.
If an interim shelf is fitted under the
hob, there must be a minimum gap of
110 mm between the top of the
worktop and the top of the shelf.
A gap of 10 mm should be left at the
back of the shelf to accommodate the
cable. For hobs with an external mains
connection box, this gap must be at
least 30 mm.
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