Yueming MF20 Product Manual page 32


L: 220V mains system phase line; must be equipped with safety electrical switch
(switch must be installed in the phase line).

N: commonly known as the neutral line, supply power to the equipment with the phase
line.

E: earth wire; the enclosures (earth terminals) of all electrical equipment are
connected to this wire to ensure safety. Resistance to earth should be less than 5Ω.
The user must consult professional electrical installer (electrician), and ask the electrician to
check and ensure that the earth wire is securely connected!
Improper grounding can cause high failure rate, and may lead to other accidents!
The Company assumes no responsibility and obligation for such failures and
accidents
Note
If the power supply system does not have earth wire, ask the electrician to install grounding
grid according to the following method:

The grounding device must be knocked into a humid place around the house with 2-4
pieces of 4×35×1500mm angle steel, the distance between each other is 1m, then lead
each piece of angle steel out of the earth with 3×30mm flat iron and form a grounding
grid.

Lay the ground grid properly, and measure its resistance to ground with the instrument
(standard resistance: 3-5 ohms).

The machine is equipped with a piece of RVV2.5mm
which one end is connected to the grounding line terminal and the other end is
connected to the earth wire of the etching machine, as shown below:
Fig. 3-6
2
yellow-green copper wire, of
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