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Electrical Safety Related Work Practices LMS Lesson 1-3

Across
Electrical workers and .... are at great risk when a circuit breaker or fuse has an interrupting rating less than the available short circuit current
..is defined in NFPA 70E as 'a dangerous condition such that contact or equipment failure can result in electric shock, arcflash burn, thermal burn, or blast.
The .... rating is perhaps the most critical rating of the over-current protective devise.
High speed fuses are permitted in lieu of branch circuit short circuit and ground fault protection on motor circuits utilizing POWER ELECTRONIC DRIVES
Down
OCPDs are used to protect appliances and some end use equipment such as luminaries and other equipment on ht load side of branch circuit OCPD.
The ... of an OCPD s to protect conductors and equipment from damage caused by thermal and magnetic effects of overcurrent.
Energized work is generally prohibited unless the employer demonstrates that deenergizing introduces additional hazards
...are installed to protect against damage which can be caused by thermal and magnetic forces due to overcurrents