3 More Questions on Red Seal Electrical IP Exam to Practice

Class 2 Conductors Red Seal Exam Questions

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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

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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

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Direct Buried Conductor Size Red Seal Exam Questions

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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

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