Instruction Sheet for Waterproof Transformers

Toroidal safety transformers for low voltage supply 12volt waterproof series are ideal for demanding applications if correctly installed by a qualified person and if the following instructions are adhered to precisely.

Isolate mains supply before installation commences.

The mains tension as well as the connected load must be the same as that shown on the label.  
Do not exceed the maximum load of the transformer.

Do not lengthen the lead from the transformer to the lamp fittings to avoid an excessive voltage drop.

The transformer is classified as Class II double insulated so it does not require an earth connection.

Black lead with label attached (230 or 240V~) must be connected to the mains supply,
where Blue is Neutral and Brown is Live.   Black lead without label must be connected to the low voltage load (lamps) – Follow transformer label indications.

Transformer, although classified as waterproof up to 30 centimetres in depth, should not be installed in water.   The Transformer’s IP68 classification can withstand the effects of accidental immersion in water due to temporary flooding of a room or after heavy rain or a storm, naturally if the mains power supply is adequately protected as well.

Transformer is therefore ideal for use in humid area or where water, rain or snow may be present.   It can be placed in an adequate inspection well, or near fountains and small lakes or other sheets of water in general.

.Transformer can also be buried directly into the ground but only after ensuring that the hole size is at least double that  of the transformer, has good water drainage and is packed with sand under, around and on top of the transformer.   This to ensure firstly, water drainage and secondly, when filling with normal earth or stones, compacting or earth settlement do not cause the risk of deformation of the housing box which would then not guarantee watertightness.  

Care should be taken that the input and output cables are not distorted near the cable glands or forced in such a way as to loosen the glands.   Protect the mains lead against abrasion or impact damage as requested by electrical rules.   To avoid housing box deformation, do not install under earth, in a walking area or transitable site.

The housing box guarantees watertightness if correctly installed, but housing deformation, from whatever cause, will not provide the same guarantee.   For this reason before using the transformer, correct installation must be controlled and assured.   Do not hold or carry the transformer by the electrical cables or install in a way that will deform the transformer housing box, as this may cause water to enter via the cable gland nuts.   Rewiring of the transformer may compromise the IP rating of the fitting and may invalidate the guarantee.   Should rewiring be necessary, for any reason, please read with attention  to the last paragraph below.

Remember that the housing box is made in plastic, so please take care not to deform the box.

Avoid installing the transformer (if it is to function during daylight hours) directly in sunlight, as the temperature within the housing box, particularly during the summer months, could reach very high levels causing the automatic thermal protection to intervene thus shutting down the transformer and resetting it only when the temperature has returned to normal levels.   The polycarbonate housing box can however, remain exposed to the sun’s rays without any adverse effect. The transformer is normally supplied with 1,8 – 2 metres of pre-wired cable.  

When requested without cables or when rewiring is necessary, transformer should be installed only by a qualified person or electrician.   When removing the lid of the housing box, care should be taken of the positioning of the washer, as this needs to be re-installed in exactly the same position after ensuring that the area is completely clean of earth, dust etc.  

Use only electrical cable with an adequate section function of load amperage and the minimum length possible on the low voltage side, to limit voltage drop.   Cables should be sleeved with heavy duty sleeving (such as HO5RN-F) with a round section.   A small section (but not below 2x0,75 mm) can be used on the primary side (a different section from primary and secondary, assists later in recognizing the mains cable, if the same colour is used).   Care should be taken to tighten the cable glands but not excessively to avoid the cable gland slipping on the    housing box with possible moisture penetration.  

Correct locking of cable with soft rubber sleeving can simply be achieved by tightening with fingers without the use of any particular type of tool.   Mains supply input cable (230 or 240 volt) is to be connected to the two pole primary terminal block where the two small brown or black (sometimes one brown and one white) wires from the transformer are already connected.   (Indications of mains supply cables are indicated on the transformer label, inside of the box).   The other two pole terminal block where the secondary coil enamelled has yellow or red copper wires are connected directly, is for the 12 or 24 volt output cable.   For ease of assembly, it is recommended that the cables are pushed  further through the cable glands, then connect the cables to the terminal blocks and tighten the holding screws.   Correctly position the washer and the lid and pull on the non-required extra cable.   Strongly screw down the lid with the supplied screws with a screwdriver and then tighten the cable glands.   Prior to positioning the transformer ensure that all the washers are correctly placed in their seating and that the lid itself does not move in respect to the housing body.   A little movement can be possible only with an application of a considerable force.  This means that the housing box is correctly closed.