Installation Instructions
| 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 |
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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. The maximum recommended length for the transformer to the lamp is 2meters, to avoid excessive voltage drop. See table below. The transformer is classified as Class II double insulated so it does not require an earth connection. |
| Blue & brown terminal (230 or 240V~) must be connected to the mains supply, where Blue is Neutral and Brown is Live. Black & Red terminals must be connected to the low voltage load (lamps) – Follow transformer label indications. |
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The Transformer’s IP 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. The WP range 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 WP range DO NOT have any fixing holes or brackets. TheTG Range should be fitted off the ground with cable inlets pointing downwards DO NOT BURY Fixing to wall using through holes below lid fixing screws. |
| 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. 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 housing box can however, remain exposed to the sun’s rays without any adverse effect. 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. 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. |
| Cable runs and sizes It should be noted that lower voltage means higher current thus when making connections between low voltage lamps and transformers the connecting cable should be larger than used in 230v lighting circuits. Also, there is the possibility of voltage drop when connecting several lamps to the same cable. The following table will help you to work out the correct length and size of cable required to make a safe connection. Maximum distances in metres for stated wattage with Voltage Drop of up to 1 Volt
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| IP Rating System (“Ingress Protection” code) Is the standard relating to the performance of enclosures in resisting the ingress of water and foreign objects. BS EN 60529:1992 Specification for degrees of protection provided by enclosures (IP code). Following the IP tag are two numbers. Eg: IP68 The first relates to the protection offered by the enclosure to solid objects and dust. 0 - Non-protected 1 - Protected against solid foreign objects of 50 mm diameter and greater 2 - Protected against solid foreign objects of 12.5 mm diameter and greater 3 - Protected against solid foreign objects of 2.5 mm diameter and greater 4 - Protected against solid foreign objects of 1.0 mm diameter and greater 5 - Dust-protected 6 - Dust-tight The second number indicates the protective qualities of the enclosure to the ingress of water. 0 - Non-protected 1 - Protected against vertically falling water drops 2 - Protected against vertically falling water drops as the enclosure is tilted 15 degrees 3 - Protected against spraying water 4 - Protected against splashing water 5 - Protected against water jetting 6 - Protected against powerful water jetting 7 - Protected against temporary immersion 8 - Protected against continuous immersion So our transformer enclosure rated to IP68 has the highest level of protection ie. 6 - Dust-tight and 8 - Protected against continuous immersion. |
Wiring information for BoatsStandard waterproof transformerWe recommend the following wiring method when using our standard waterproof transformers to eliminate the risk of galvanic corrosion between your boats hull and other boats or metal objects. A link is used to bond the earth & neutral on the transformer output as this will allow the boats fuses & RCDs to operate correctly whilst isolating the shore power earth. |
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Hull Isolation Waterproof TransformerOur hull isolation waterproof transformers have an additional safety earth screen between the primary & secondary windings. This is connected to the shore power earth and will trip the shore power RCD or circuit breaker in the highly unlikely event of insulation breakdown in the transformer. We recommend the following wiring method when using our hull isolation waterproof transformers to eliminate the risk of galvanic corrosion between your boats hull and other boats or metal objects. A link is used to bond the earth & neutral on the transformer output as this will allow the boats fuses & RCDs to operate correctly whilst isolating the shore power earth. |
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