winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
250.2 and 250.4(A)(5) define and require an Effective Ground Fault Current Path which must be permanent, low-impedance, electrically conductive, and which facilitates the operation of the overcurrent device (among other wording and requirements.
My question: what qualifies as 'facilitating the operation of the overcurrent device', and what qualifies as 'low-impedance'?
Do the characteristics of the overcurrent device change the requirements placed by 250.4(A)(5), and in particular, if a GFCI breaker is used, would an otherwise unsuitable conductive path (eg. the armor of old BX cable without the bonding strip) be rendered an acceptable equipment grounding conductor?
-Jon
My question: what qualifies as 'facilitating the operation of the overcurrent device', and what qualifies as 'low-impedance'?
Do the characteristics of the overcurrent device change the requirements placed by 250.4(A)(5), and in particular, if a GFCI breaker is used, would an otherwise unsuitable conductive path (eg. the armor of old BX cable without the bonding strip) be rendered an acceptable equipment grounding conductor?
-Jon