Electrician Red Seal · Question
A feeder runs 75 meters to supply a 40A load on a 120/240V single-phase system. Using #6 AWG RW90 copper conductors, what is the approximate voltage drop?
First, calculate the total length of the conductor (go and return): 2 * 75m = 150m. Convert to km: 150m = 0.150 km. Calculate total resistance: R_total = 0.150
Start free practice for Electrician Red Seal
150 questions · no signup required · 40 free questions per day
Question: A feeder runs 75 meters to supply a 40A load on a 120/240V single-phase system. Using #6 AWG RW90 copper conductors, what is the approximate voltage drop?
Answer options:
- 4.2 V
- 6.3 V ✅ 8.3 V
- 10.5 V
Correct answer: 8.3 V
Explanation: First, calculate the total length of the conductor (go and return): 2 * 75m = 150m. Convert to km: 150m = 0.150 km. Calculate total resistance: R_total = 0.150 km * 1.39 Ω/km = 0.2085 Ω. Finally, use Ohm's Law for voltage drop: VD = I * R = 40A * 0.2085 Ω ≈ 8.34 V.
Start free practice for Electrician Red Seal
150 questions · no signup required · 40 free questions per day
More about Electrician Red Seal
Related Questions
- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
- During a renovation of a commercial kitchen, an electrician needs to replace an old single-phase, 240 V, 5 kW
- A commercial kitchen is being renovated, and several new 4 kW, 208 V, single-phase electric ovens are being in
- What is the minimum working space depth required in front of an electrical panel rated 200 A, 120/240 V, locat
- A Red Seal electrician is setting up temporary power for a construction site. The main temporary service is a
- A new industrial facility requires a 600 V, three-phase, 150 A feeder to supply a motor control centre. The co
More for Electrician Red Seal candidates
Practice tests
Question explanations
- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
- During a renovation of a commercial kitchen, an electrician needs to replace an old single-phase, 240 V, 5 kW
- A commercial kitchen is being renovated, and several new 4 kW, 208 V, single-phase electric ovens are being in
- What is the minimum working space depth required in front of an electrical panel rated 200 A, 120/240 V, locat
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Electrician Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.