Recent content by alan2023

What application is that in the snip?

Yes, I'm still here. Without getting into all the nitty-gritty with the inner workings of an LED driver/fixture, I believe I'm starting to understand a bit more how the loads after a point on a circuit affect the voltage drop. Looking at this original question from an electrical install...

Yes, I believe 0.35 amp RMS sinewave. Just typical 120v AC 60 hz power you would find in the USA. No PF control. For simplicity, yes, just figure 120/.35=342.86 ohms.

This is actually a real world install. The .35A loads are LED bollard lights installed along a walkway. The #12 is THHN insulated wire installed 24" underground in PVC conduit. (I believe we actually installed #10 THHN) The 120v is AC nominal voltage,(could be anywhere from 115-125v, let's...

Sounds good, thank you for your time. Mike Holt Voltage Drop This is a copy/paste from one source on that method. The chaper and tables are referencing the National Electric Code book. Voltage Drop Using the Formula Method When the circuit conductors have already been installed, the voltage...

I think we're getting off track. I know there are different methods of figuring voltage drop. You are using the resistivity of the copper wire. I'm using the 2KIL/CM method. That's a topic for another conversation. I guess I really just wanted to understand the science of how the voltage drop...

Just adding all the voltage drops together in the column "V. Drop"

This is the entire table. I just did the math for each load separately. Looks like total voltage drop would be 5.91 if this is the correct method.

Cir. # Phase (1 or 3) (2 for 1 phase; 1.732 for 3 phase) COPPER/ALUM. (12.9/COPPER,21.2/ALUM.) Amps Distance (feet) Applied Voltage Size Wire CM V. Drop 1 2 12.9 0.35 85 120 12 6530 0.12 1 2 12.9 0.35 130 120 12 6530 0.18 1 2 12.9 0.35 170 120 12 6530 0.24 1 2 12.9 0.35 205 120 12 6530...

That's exactly what I want to figure out mathematically without measuring each one.

That table is from my example. All the same loads. Varying distances.

Cir. # Phase (1 or 3) (2 for 1 phase; 1.732 for 3 phase) COPPER/ALUM. (12.9/COPPER,21.2/ALUM.) Amps Distance (feet) Applied Voltage Size Wire 1 2 12.9 0.35 85 120 12 1 2 12.9 0.35 130 120 12 1 2 12.9 0.35 170 120 12 1 2 12.9 0.35 205 120 12 1 2 12.9 0.35 245 120 12 1 2 12.9 0.35 290...

Let's say for this example all loads the same resistive load just different distances. All on at the same time.

I'm trying to determine how to measure mathematically the voltage drop at various points along a circuit with loads at different points along the way. Let's assume all loads on 100% when the circuit is on. For a basic formula I use (for single phase): 2 * K-Value (12.9 Cu) * Amps *...