MarineTech
Member
- Location
- Camarillo, CA
Article 240 Overcurrent Protection: Rule 240.4(D) Small Conductors.
Unless specifically permitted in 240(E) or (G), the overcurrent protection shall not exceed that required by (D)(1) through (D)(7) after any correction factors for ambient temperature and number of conductors have been applied.
Question:
In reference to "after any correction factors for ambient temperature and number of conductors have been applied", how would conductor derate and correction effect selection of the maximum allowed OC device for small conductor, when the rule makes OC size manditory per small conductor wire AWG?
For example, Maximum OC for 14 AWG Copper is 15 Amps.
Would it be clearer for electricians and inspectors if the rule omitted "after any correction factors for ambient temperature and number of conductors have been applied" and simply stated:
Unless specifically permitted in 240(E) or (G), the overcurrent protection shall not exceed that required by (D)(1) through (D)(7).
Unless specifically permitted in 240(E) or (G), the overcurrent protection shall not exceed that required by (D)(1) through (D)(7) after any correction factors for ambient temperature and number of conductors have been applied.
Question:
In reference to "after any correction factors for ambient temperature and number of conductors have been applied", how would conductor derate and correction effect selection of the maximum allowed OC device for small conductor, when the rule makes OC size manditory per small conductor wire AWG?
For example, Maximum OC for 14 AWG Copper is 15 Amps.
Would it be clearer for electricians and inspectors if the rule omitted "after any correction factors for ambient temperature and number of conductors have been applied" and simply stated:
Unless specifically permitted in 240(E) or (G), the overcurrent protection shall not exceed that required by (D)(1) through (D)(7).