DEMAND SWITCHES

…automatic removal of disturbing mains fields

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ELECTROSTRESS

Please note that these Demand Switches are not suitable for use in the USA

It is now agreed by many scientists and doctors in Europe and America that our constant exposure to the electrical and magnetic fields given off by all mains wiring can disturb the health of all of us - and not just the relatively small number of extreme 'electrical sensitives".
Because of the extremely rapid growth of the use of electricity - and the ever-increasing number of sources (radio and TV, computers, mobile phones, microwaves and radar, etc.) we are all in danger of 'drowning' in the electromagnetic soup we have made. Radio-frequency waves alone are now several hundred million times the level we get naturally from the sun -and which we have evolved to live with. Just as allergies often develop from over-exposure to hitherto harmless substances so, it appears, more and more of us are becoming sensitised to electromagnetic fields.

NIGHT TIME PERILS
Building biologists and other specialists in this area agree that we need to take special care at night for a number of reasons:
Some of the highest field levels are found in bedrooms. Cables for downstairs lighting,upstairs power and lighting, the immersion heater, etc., all commonly run in the floor, walls and ceiling of the bedroom. A fact that surprises many people is that cables radiate electrical fields even when everything is switched off.
With its bedside lamps, clock radios and alarms, electric blankets, television sets and so on,
- the bedroom often has even more electrical apparatus than the kitchen.
- most people spend more time in the bedroom than any other single place.
- and it is while we sleep that the body repairs itself and grows, depending for this on
interference-free sending and reception of complex electrical messages.

The bed we sleep in is literally surrounded by a cage of electrical and electromagnetic radiation. Because we use Alternating Current (AC) as our source of energy, this continually flows through the wiring in our homes and buildings and this creates these harmful electrical fields, even when everything is switched off. We generally sleep on mattresses which are full of metal springs which collect and radiate this negative energy into our bodies whilst we rest. Sleep is the time when our body repairs itself and if the body is subjected to electrical and electromagnetic stress during this time, the immune system is suppressed and prevented from carrying out its natural repair process fully.

Demand Switches work quite simply by shutting off the electricity at the fuse box, or meter. For example, fitted to the lighting circuit, when the last light is switched off at night (or during the day in daylight hours), the Demand Switch shuts off the electricity to the lighting circuit at the fuse box. Therefore, there is no current passing through the wiring and therefore no electrical radiation given off either. Simple, yet 100% effective protection from electrical fields given off by the lighting circuit whilst we sleep, allowing the body to repair itself naturally. However, when the light switch is operated, electricity is restored to the circuit and the light operates as normal.

So the easiest and most effective way of removing these unwanted fields from our bedrooms in most cases is to use Demand Switches - and these are described below.

NT DEMAND SWITCHES

There are two models - the NT 16-plus and the NT 20-plus. They differ only in the maximum load with which they can deal:
NT 16-plus: nominal rating 16A, maximum 18A. Recommended for lighting circuits.
NT 20-plus: nominal rating 20A, maximum 34A. Recommended for ring mains and other domestic power circuits.
Action. The NT Demand Switch is installed in modern DIN distribution boards or next to older fuse boxes and is wired into the Line of the circuit to be protected (see wiring diagram below).
When there is no load on the circuit, that is, when everything is switched off, the NT Demand Switch automatically disconnects the Line at the fuse box. It can sense (by use of a biologicallv neutral 4-volt DC current) the moment any switch in the circuit is turned on and instantly restores power. There is therefore no danger of being "left in the dark" at night.

(a) To unprotected areas - fridges, boilers, etc.
(b) To one or more protected rooms
- bedrooms
- nurseries, etc.

Additional Technical Information

Supply voltage : 220V AC/5O Hz nominal but will tolerate 170V to 250V
Dimensions : 34 mm wide x 71.5 mm high (as wide as two MCB's)
Switching delay : on - nil; off - 3 seconds
Switching sensitivity: on- l5mA; off - 10mA (both adjustable to suit conditions)
Override: manual switch connects circuit continuously. Available in the event of failure of
automatic switching.
Indicators : standby-green LED; circuit connected - red LED

Mounting (for non-DIN boards): optional bracket supplied (with screws and wall plugs) together with terminal cover.
Protection : the device is protected against interference from external inductive fields. It will not produce any stray fields itself.
Safety : the device meets all relevant EC standards.
Durability: excellent. Samples have continued to operate perfectly after over 20,000 cycles at
4 second intervals (load 2,200 watts).

Full installation and operating instructions are supplied. The NT Demand Switch can normally be installed in 30 minutes or less.

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