Maximum Disconnection Times

[Cookie]

What is the reasoning behind having a 0.8 disconnection time for up to 120 volts Uo, but it then jumps to 0.4 seconds as soon as you go over it? Wouldn't it be better 0.8 seconds for 150 volts Uo and under, 0.4 seconds 150 volts and over Uo?

 

[Cookie]

Center tapped 240 is 120. Line to line 240 produces 138.

Republic of the Philippines uses this system.

Yes, BS7671 and IEC codes on how they would go about dealing with those two voltages.

I'm well aware line-line 240 is rare in Europe.

 

[DPG]

Center tapped 240 is 120. Line to line 240 produces 138.

Republic of the Philippines uses this system.

Yes, BS7671 and IEC codes on how they would go about dealing with those two voltages.

I'm well aware line-line 240 is rare in Europe.

Err OK then.

 

[Cookie]

Its ok. Just this forum is to quick to assume things.

 

[Megawatt]

Center tapped 240 is 120. Line to line 240 produces 138.

Republic of the Philippines uses this system.

Yes, BS7671 and IEC codes on how they would go about dealing with those two voltages.

I'm well aware line-line 240 is rare in Europe.

In a star connection phase to phase is 240 vac phase to earth 120vac the voltage you read can be as high as 130vac the same goes with 3 phase. It’s a plus or minus 5% on the voltage in the US

 

[Cookie]

138-139 volts, at 252 volts (+5%) it is 145 volts.

 

[Megawatt]

138-139 volts, at 252 volts (+5%) it is 145 volts.

That highest voltage I’ve seen is 130 to ground and where are you getting 138vac
[automerge]1574368977[/automerge]

That highest voltage I’ve seen is 130 to ground and where are you getting 138vac

Your drawings are irrelevant that’s not telling us nothing

 

[Cookie]

130 volts would be the highest in a 120/208 system, not a 240 volt wye system.

The drawings are correct for the system being depicted.

 

[static zap]

Also got a post deleted in another thread for saying the stuff on Amazon made by China is often not safe to install.

Tricky tight rope - Negative opinions ..
( I'm older and just love moaning )
You get what you pay for, (and some local wholesalers risk a big hit , when they have to honour their returns policy)
Need to educate customers to spend more!

 

[Cookie]

Education is key. Which is why I spoke up. But shady manufacturers/sellers know people buy solely based on cost.

 

[Megawatt]

130 volts would be the highest in a 120/208 system, not a 240 volt wye system.

The drawings are correct for the system being depicted.

On paper is one thing, in the real world it’s a totally different world. Why the emphasis on exactly 138vac

 

[Cookie]

Due to Uo (138 volts) changing the disconnect time requirements.

 

[Megawatt]

Where's my post gone? I was sticking up for the forum!!!

I’m from the US and we don’t have those kind arrangements

 

[DPG]

I’m from the US and we don’t have those kind arrangements

I think there's some confusion between systems.

 

[Megawatt]

I think there's some confusion between systems.

DPG confusing is an understatement I don’t know if the OP is asking a question or trying to teach us. LOL

 

[Cookie]

Asking about the code's reasoning. And Megawatt- I fully get you!