Class 2 Conductors Red Seal Exam Questions
Practice Exam Question
For four No. 18 AWG Class 2 conductor installed in a raceway, __________ is the maximum rated amperage.
CEC Code
Rule 16-210(6), Table 5C and Table 57.
Walkthrough
Ampacity of No. 18 AWG - 5 A
Correction Factor for 4 - 0.8
Ampacity - 5 x 0.8 = 4 A
Transformer and Bonding Red Seal Exam Questions
Practice Exam Question
The minimum size of copper bonding conductor is __________ between a 500 kVA, 4160 V / 600 V, 3Ø pad mount transformer with primary overcurrent protection set at 90 amps, and the 3Ø distribution equipment. The transformer feeds the distribution equipment with RC90 single conductor cable.
CEC Code
Rule 26-256 and Tables 1 and 16
Walkthrough
Secondary overcurrent = primary overcurrent device X turn ratio = 90 x (4160/600) = 621 amps
621 amps on Table 16 = 0 AWG copper bonding
Direct Buried Conductor Size Red Seal Exam Questions
Practice Exam Question
The minimum size of RW75XLPE service copper conductors using two conductors per phase is __________ when installed in two runs of direct buried rigid PVC conduit. The 400 A, 120/208 V, 3Ø, 4-wire service was installed for a commercial retail store in a manner similar to Diagram D11, Detail 2.
CEC Code
Rule 4-004(1) (d) and Table D11A
Walkthrough
Minimum ampacity of RW90XLPE: 400 / 2 = 200 A
Minimum RW90XLPE conductor size: No. 2/0 AWG; Table D11A