《C-453EM Sigma》.pdf

sIGMa MONItOR RElaY GROUND FaUlt RElaY / REsIstOR MONItOR a the power to protect m g i s Instruction Manual C-453EM SIGmA mOnITOR RELAy Neutral Grounding Resistors (NGR) are an integral and critical component in a grounding protection scheme and in many ways are similar to fuses in that they nothing until something in the system goes wrong. Then, like fuses, they protect personnel and equipment from damage. Damage comes from two factors, how long the fault lasts and how large the fault is. Ground fault relays trip breakers to limit how long a fault lasts. Neutral grounding resistors limit how large the fault is. The Sigma relay not only monitors the Neutral Grounding Resistor to ensure its functionality and that it is available for use but is also a ground fault relay. DANGER Hazard of Electrical Shock, Burn or Explosion All installation, servicing and testing referred to in this manual must be performed by qualified personnel. All power shou