Nec Ocpd Ratings: 450.3(A)#circuit_breaker##supervised_high_z
NEC Section 240.6(A) standard overcurrent protective device (OCPD) ratings — standard ampere ratings for fuses and circuit breakers
| nec section | rating amp | description | device type | notes | secondary protection pct | transformer impedance pct max |
|---|---|---|---|---|---|---|
| 450.3(A)#circuit_breaker##supervised_high_z | 400 | Transformer primary OCPD — % of primary rated current | circuit_breaker | Primary-only protection; supervised location; transformer impedance >6%; CB rated at 400% of primary FLC | 400 | supervised_high_z |
This is a sample. Search the full nec ocpd ratings dataset and 300+ more by creating a free account and accessing the database.
Get started for FREERelated data
240.6(A)3 rows240.86#arc_fault_circuit_interrupter#2 rows430.52(C)(1)#dual_element_time_delay_fuse#ac_squirrel_cage_design_b1 row430.52(C)(1)#dual_element_time_delay_fuse#ac_squirrel_cage_other1 row430.52(C)(1)#dual_element_time_delay_fuse#dc_constant_voltage1 row430.52(C)(1)#dual_element_time_delay_fuse#single_phase1 row430.52(C)(1)#dual_element_time_delay_fuse#synchronous1 row430.52(C)(1)#dual_element_time_delay_fuse#wound_rotor1 row430.52(C)(1)#instantaneous_trip_breaker#ac_squirrel_cage_design_b1 row430.52(C)(1)#instantaneous_trip_breaker#ac_squirrel_cage_other1 row430.52(C)(1)#instantaneous_trip_breaker#dc_constant_voltage1 row430.52(C)(1)#instantaneous_trip_breaker#single_phase1 row