Safety, EMC, EMF, ESD norms, equipment labeling, standards and compliance
MPR-e 39
Dangerous electrical voltages:
Labeling
The following warning label is affixed next to dangerous voltages (>42.4 Vp; >60 VDC).
If the product is a Class 1 equipment connected to mains, then the label associated with it
states that the equipment must be grounded before connecting it to the power supply voltage,
For example,
Safety instructions
Personal injury can be caused by -48 VDC. Avoid touching powered terminals with any
exposed part of your body.
Short-circuiting, low-voltage, low-impedance DC circuits can cause severe arcing that can
result in burns and/or eye damage. Remove rings, watches, and other metal jewelry before
working with primary circuits. Use caution to avoid shorting power input terminals.
Risks of explosions: labeling and safety instructions
This risk is present when batteries are used, and it is signaled by the following label:
Danger: Carefully observe the specific procedures for installation, turn-up and
commissioning and maintenance of equipment parts where DC power is present, described
in the relevant installation, turn-up and commissioning and maintenance documents and the
following general rules:
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