majesus
Electrical
- Aug 16, 2007
- 262
The MSHA and CSA requires a ground conductor monitoring system for movable equipiment in mining application. I can't seem to find in either codes any details in the type of ground conductor monitoring.
An impendance monitoring system seems to meet the requirements, however this type of system won't detect parallel return ground paths. Thus the possibility may occur where the grounding conductor breaks, yet still be grounded.
A continuity system that injects an audio signal will detect this, however is it necessary for compliance?
The disadvantage is its prone to ac induced noise as well as its limiation in distance.
An impendance monitoring system seems to meet the requirements, however this type of system won't detect parallel return ground paths. Thus the possibility may occur where the grounding conductor breaks, yet still be grounded.
A continuity system that injects an audio signal will detect this, however is it necessary for compliance?
The disadvantage is its prone to ac induced noise as well as its limiation in distance.