The electrical installation in a house sees to it, that you are provided with plug sockets and spots of light all over the place. Sometimes it could happen to be necessary to extend this installation. For example if the attic is being reconstructed into a room or if a new kitchen is going to be installed.
The tension which is applied in The Netherlands amounts to 230 volt.
If we are going to use appliances, we’ll have to take into account how many of these appliances we want to connect to the same tension group. There are fuses ranging from 6 to 10 as well as to 16 amperes. When such a fuse is being overloaded, it will be blown. Of course this is just a security device. By dividing the number of watts by the number of volts, you’ll be able to calculate the number of amperes.
Colors of the electrical wires
In case of the electrical installation of a house, the 4 below mentioned wire colors are usually being used:
- Brown: phase-wire
- Blue: neutral-wire
- Yellow/green: ground-wire
- Black: switch wire
In more old fashioned houses this could be different:
- Green: phase-wire
- Red: neutral-wire
- Grey: ground-wire
The Meter cupboard (box)
The bottom part of the meter cupboard consists of a sealed box, an electricity meter and a distribution box. These parts are only accessible to employees of the energy supplier. In case of major alterations we advise you to contact NOVO.
When you look into the meter cupboard, you’ll see a number of fuses installed. A fuse is a security device which disconnects the electricity in case of short circuit or overstrain. The number of fuses in the meter cupboard is an indication of the number of groups into which your meter cupboard is divided. You can shut off any group you want to by turning over the switch situated next to the meter cupboard. You’ll also see an earth leakage circuit breaker, situated in a box provided with a test button. If you get in touch with a device which is energized, this breaker sees to it that the electricity will be shut off in a split second.
Wires are to be installed in a PVC tube with a 16 mm diameter. If there are still iron pipes in practice, you should replace these by PVC tubes as soon as possible.
You can link wires to each other by means of sockets. If the wire has to be attached to the wall, you’ll have to fasten these with locking clips, keeping distances of 40 to 50 cm between them. If the pipe has to be milled into the ground, you should do this in an undulating movement. Doing so the pipe will be better fastened into the groove (trench). For the benefit of installing branches, switches or plug sockets, there are numerous kinds of boxes for sale.
Tip-offs while working with electricity
You should always take care of disconnecting the electric power. You do so through turning off the main switch and by taking out the safety fuse. Ensure yourself for safety’s sake by means of a volt meter whether you really have turned off the power. You also always should take good care of working with properly isolated tools and you should wear shoes with rubber soles. Use a wooden stair instead of an aluminium one to avoid the arising of electrical conductivity. Be careful while using water and avoid going to work outside in rainy weather.
In case of bathrooms we should be especially alert. It’s very important that you strictly stick yourself to the regulations. Water and electricity are in combination with each other extremely dangerous. Electricity companies for this purpose consequently are handling the following guidelines: Wet rooms without (A) or with (B) an earth leakage circuit breaker (RCD)
A: This is a group without earth leakage. On this group you’re not allowed to place a plug socket. A light switch could be connected, but it should be situated on a high spot and should be used as a ceiling pull switch only. Furthermore the light which is to be applied in this room has to be waterproof, earthed or double isolated. Halogen lamps are only allowed to use in this place, provided that the 24 volt transformer has been situated outside the wet room
B: This concerns a group provided with an earth leakage. The electricity company has made a special zoning classification for this category.
Extension and safety fuses
Before you’re going to expand, you’ll have to be absolutely sure that the fuse is not going to blow up caused by this expansion. The quantity of electricity which is used by a device, is expressed in amperes (A). If you multiply the electricity with the tension (voltage), you are determining the capacity (W). Usually the capacity is mentioned on a lamp or on a device. By adding up the number of watts of each device, which is used on that group and then dividing the outcome by 230 (volts), the result will be the electrical power measured in amperes. You can see on the indications on the fuses how many amperes they will be able to endure at the most. When the fuse is provided with a red indication on its backside, it should be able to endure 10 amperes. On the other hand, if the fuse is provided with a grey indication on its backside, it should be able to endure even 16 amperes. So in case of a fuse, which endures up to 10 amperes, you’ll be able to use 10 x 230 = 2300 watts at the most and in case of a 16 ampere fuse this should be 3680 watts at the most.