Siemens SINAMICS S120 Combi Equipment Manual page 39

Danger to life through electric shock as well as fire hazard due to overcurrent protective
devices that trip too late in TT line supplies when an insulation fault occurs
Overcurrent protective devices that do not trip or trip too late can cause an electric shock or
fire.
• Generally, due to the higher loop impedance of TT line supplies, the installed
Danger to life through electric shock as well as fire hazard due to overcurrent protective
devices that trip too late
Overcurrent protective devices that do not trip or trip too late can cause an electric shock or
fire.
• To protect personnel and for fire protection purposes, at the infeed point, the short-
Danger to life due to electric shock caused by oversized fuses
Oversized fuses can result in significant levels of danger and also faults.
• Use an adapted fuse corresponding to the table "Recommended line fuses and circuit
SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
3.3 Overcurrent protection by means of line fuses and circuit breakers
WARNING
overcurrent protection devices are not tripped within the prescribed period if an
insulation fault occurs.
When operating on TT line supplies, use a residual current protection device (see
Chapter Line supply connection via residual-current devices (Page 40)) in addition to the
overcurrent protective device.
WARNING
circuit rating and loop impedance must correspond to the specifications in the
documentation in order for the installed overcurrent protection devices to trip within the
specified time.
WARNING
breakers for S120 Combi Power Modules".
Line-side power components
39