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A method used for chasing out moisture in pyro. After removing the pot, use the flame of a gas torch or blowlamp, starting about 2 metres from the end; and working towards the near pot end, retesting for the insulation value, if still low: - do the other end. Jaymack

The sky decoder feeds a voltage on the cable, to the transponder in the dish, this is probably the cause of your shock. Jaymack

One example of dangerous situations that could arise with a reversed polarity: - say a youngster stuck a metal impliment inside a toaster; or an appliance with an open element such as an electric fire. The neutral would be switched; but the element would be live at all times, with a high risk of...

Any advice on testing a washing machine and fridge?, this is for a landlady certificate (or landperson), to be PC. I suggest using a portable appiance tester, although not a portable unit; but basically similar electrically IMO. Jaymack

Will still work, that's a problem. It's dangerous. It requires to be corrected. Jaymack

New build, rewire or addition? Jaymack

For a new installation, can the OP tell us, what type of cable is it? Jaymack

By whom?, where do see this in BS7671? One reason that they are, is due to the fact that they require a connection to earth to operate, Sometimes seen in older TT installations as the man said, can you give any others. He's in the british virgin islands, next door to Blackpool? Jaymack

In the UK, these require to be replaced by RCD's under the new regulations to BS7671. Read all about it: - The term Earth leakage circuit breaker (ELCB) is often incorrectly used to describe its modern counterpart the Residual-current device (RCD). An earth leakage circuit breaker (ELCB)...

Amazing what you will find if you search: - From a web site on the bell push byron 4217. Bell Pushes are solid brass and can be used with existing door bell systems. Lighted Bell Pushes cannot accept more than 12 volts from a transformer, nor can they be used with a battery powered bell...

I suspect this is a dc machine, what is the voltage? Jaymack

Max Core Sizes for SOs Clause 11.5 of BS1363-2 states: "Line and neutral terminals in fixed socket-outlets shall permit the connection, without special preparation, of one, two or three 2.5 mm2 solid or stranded or of one or two 4 mm2 stranded conductors." But: - First page of...

Do a search; and all will usually be explained: - http://en.wikipedia.org/wiki/Three-phase_electric_power Jaymack

You have probably disturbed a connection at the lighting point, resulting in loss of supply. Jaymack

Not so scary, it is usual to have at least O/C and E/F protection on the HV side of the transformer, using fast acting electronic relays. This is a common way of supplying industrial LV boards. Jaymack

The OP referred to the heating effects on coiling of cables: - “When does it become potentially dangerous for a 240v live strand to be coiled? i.e. how many turns of the coil would render the cable to dangerous overheating?” What you are referring to is the cumulative effect of bunched cables...

If this is a single core cable on alternating current, coiling it would create an inductance coil and impedance into the circuit; but this is minimal for a few turns. The resistance would virtually remain the same, therefore there would be no increase in the temperature. Jaymack

With Class I (earthed) equipment, if the earth continuity disappears, any current that would have travelled down the CPC can travel through a person touching conductive parts of the Class I equipment. If the available "touch current" is high enough, it can kill. There doesn't need to be a...

We moved into a 50's house recently. We have inherited a small toilet which has a space saving, plastic, cistern with a plastic outlet pipe to the bowl, the cistern has reduced depth; but is taller to compensate for this depth reduction. The bowl is not efficient since it won't flush...