Safety rules
MPR-e and MSS-1c User Manual 3DB19901EFAA Edition 01 47
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.
2.4.2.2 — Risks of explosions: labeling and safety instructions
This risk is present when batteries are used, and it is signaled by the following label:
Therefore, slits or apertures are made to let air circulate freely and allow dangerous gases
to down-flow (battery-emitted hydrogen). A 417-IEC-5641 Norm. compliant label is
affixed next to the slits indicating that the openings must not be covered up.
2.4.2.3 — Moving mechanical parts: labeling and safety instructions
The following warning label is affixed next to fans or other moving mechanical parts:
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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