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Headshot

David, go look at a transformer (it isn't necessary to say "step-down" since that is assumed unless it is a step-up transformer...such as at a generation unit). Wolf is correct on his drawings. The legs are both ungrounded on VECO transformers, and the center point is grounded. If you tap the grounded center point on the VECO transformer with a neutral, you would have 120 volts between the neutral and each of the legs (just like you get with the North American transformer). If one of the legs is grounded (as on the CEBECO transformer), then all you can get is 240 volts.

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David_LivinginTalisay

David, go look at a transformer (it isn't necessary to say "step-down" since that is assumed unless it is a step-up transformer...such as at a generation unit). Wolf is correct on his drawings. The legs are both ungrounded on VECO transformers, and the center point is grounded. If you tap the grounded center point on the VECO transformer with a neutral, you would have 120 volts between the neutral and each of the legs (just like you get with the North American transformer). If one of the legs is grounded (as on the CEBECO transformer), then all you can get is 240 volts.

Headshot, so how do you explain my Meter Reading of 200V to ground on one leg, and only 30-40V on the other leg to same ground (240V across the two L1 - L2) of the VECO feed to our house in Talisay, if it is Cente Tap grounded Transformer as you suggest for VECO?

 

I think I will post this question to VECO on Facebook, and see what they say!

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Headshot, so how do you explain my Meter Reading of 200V to ground on one leg, and only 30-40V on the other leg to same ground (240V across the two L1 - L2) of the VECO feed to our house in Talisay, if it is Cente Tap grounded Transformer as you suggest for VECO?

 

I think I will post this question to VECO on Facebook, and see what they say!

 

It's called floating voltages (which is common where the system is poorly grounded), and it means that likely your ground is not tied to the ground at the transformer (and may not be a good ground at all). As you apply load to one leg (leg to neutral), it lowers the voltage on that side and the other leg spikes proportionately. It probably won't affect anything that uses 240 volts, but it will really mess up anything that uses 120 volts and is connected from leg to grounded neutral.

 

It can be solved by driving a good ground tied to your breaker panel ground point, and running a grounded neutral from the transformer center point to the breaker panel (where it is also tied to ground. That will prevent float. However, that isn't cheap, and it is probably better for you to only use the leg to leg voltage (220/240 volts), and use a small dry transformer for any 120 volt needs.

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