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You have a value of Zs and 80% of that is 80% independent of voltage. The OSG uses a more complicated formula based on max temp of the cables etc. The 80% rule is just a quick and dirty method and good enough for most situations. I am up in Yorkshire and don't have my books. From memory its...

I can see the plumbers laughing now!! Plumber apprentice "What's that for?" Plumber "Shhhh it keeps the sparkies happy!!"

Nice post Manator!!

+1 Dynamic DNS, I have done a few dozen CCTV systems and used DynamicDNS each time with no problems. They have been going for some years now, first time I used them was 2002 and last time was March!

I have been thinking about this a lot and have come up with the win win situation!! It's called Peter's 2 step retirement plan!! 1) Keep your head down till 65 or maybe 70. 2) Rob a bank, if you get away with it you're are minted for life problem solved. If you get caught, you get banged up...

It sounds as if they have under-volt protection and need to be power cycled in order to re-start them, as Evans Electric mentioned. If they have it's a pretty poor design for a hi bay fitting.

When there is a power dips, can you switch all the lights off for 20 mins then switch them back on and see if that makes a difference? Maybe better than getting the lift out? Or better still after the power has dipped leave for 20 mins then turn the lights off and on? The Philips lights will...

This guy related to you ADS? Banana

Hehehe joking apart, you actually did an insulation resistance test on a banana!! You are funny!! Actually I was going to do the same but we are all out of bananas!!

Banana water pipes!!

Bananas contain potassium! So may be conductive!!

Hi mate I wrote a little bit about this a few years ago, Have a look at post#7

Protective Bonding Conductors

Just to add, I don't know if anybody has seen this film called "Micro Men" made for BBC 4? It stars Alexander Armstrong from Armstrong and Miller as Clive Sinclair (Sinclair Research) and also Martin Freeman from The Office as Chris Curry (Acorn). It's a very funny film all about how they...

Immersion heater??

If the water pipe feeds a shower or a boiler etc, then the metal work it connects to within the shower or boiler is earthed if you follow that earth back to the MET it then connects to earth electrode at the incoming source if it's a TT or further up stream if it's a PME system or at the sub for...

OK so it may not be that good, resistivity of tap water is around 0.1Meg ohm/meter, doh!!

You may be talking about pure water, but I would bet the water that comes out of your tap conducts. Tap water conducts electricity because it contains ions. These ions provide a transport system for the flow of electrons.

It may be plastic but the water inside the pipe may eventually come into contact with metal pipe work further up the water network. It also connects to all the other pipework in the house which will now be at earth potential. Earthing the pipes also mean that the potential of the pipes in the...

I was taking it as a single supply to a single dwelling. I will hold my hand up and say if it to be classed as a building site then and I am not fully clued up and would then have to go and have a read. This is just what I remembered off the top of my head regarding the ESQCR and earthing...