On Thu, 09 Feb 2017 17:38:16 -0000, trader_4 wrote:

On Thursday, February 9, 2017 at 10:15:52 AM UTC-5, James Wilkinson Sword wrote:
On Thu, 09 Feb 2017 14:53:02 -0000, westom wrote:

On Wednesday, February 8, 2017 at 5:18:18 PM UTC-5, James Wilkinson Sword wrote:
I can't believe it's that likely for 4800V to get onto a 240V line. Possible, but so rare it's not worth bothering to install protection. I protect against little spikes, or voltages about 30V under/over what they should be.

30 volts and higher is already solved inside each appliance. Why would anyone spend money to protect from something that does not even cause damage? That is already made irrelevant by what already must exist inside every appliance?

Might do in quality appliances, but not cheap ones, or LED lightbulbs.


Even cheap appliances have MOVs for small surges and will tolerate the
~ 12% overvoltages you're talking about. I don't have much experience
with LEDs, but see no reason why they can't tolerate your 12% over voltage
for seconds.

More like about 3 hours.

If all these things were as sensitive as you claim, we'd
see a lot of failures. I sure don't.

Do you have 3 hours of 30 volts over? Do you have cheap LED lightbulbs?

A 33,000 volt wire fell upon the local distribution. Even electric meters were blown 30 feet from their pans. Many suffered appliance damage and destroyed protectors. At least one suffered damaged circuit breakers.

I'm glad our HV lines aren't hung up in the air!

Apparently the power company is lying then.

http://www2.nationalgrid.com/uk/serv...verhead-lines/

Are you blind?

Most overhead lines here are the big 330kV pylons. The 11kV you were referring to doesn't tend to run down the streets alongside the 240V.

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