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Good Quality Of Light Fittings –Porcelain Lamp Holder

As we all know, one of the worst enemies of light fittings is heat. This is why it is a bad idea to put in a stronger bulb than the manufacturer recommends. Even with the right bulb heat will cause low quality lamp holders to fail as well, and worse the insulation on the power supply wires to break down.

A minimum should be a porcelain lamp holder with the wires connecting it covered in heat insulation.

If the fitting is made of plastic the heat will make it brittle over time and if it is made of zinc alloy the heat may cause it to distort.

These problems are minimised by using polycarbonate or aluminum castings, which of course means the fitting will cost more but anyone who has had a bulb stuck in a seized socket or has a down light not sitting flush will think it worth it.

Ultra violet light from the sun breaks down plastic and low quality powder coating. Zinc alloy corrodes, and this can be rapid if it is in contact with acid soil.

Aluminum with good quality powder coating will stand up well but if it is in contact with a dissimilar metal the electrolytic action will have it crumbling away in no time. Good idea to use stainless steel screws to fix the light and definitely not mild steel screws.

The best materials for external lighting are the brass, copper and stainless steel lights, but again the best quality is expensive. If the fittings are lightly built to save material they will not absorb the heat as well as a robust solid light.

Even after buying a stainless steel light you can be shocked to find that is starting to show rust stains. This is because there are various grades of stainless steel. For cheaper lights grade 304 is used and this will corrode very slowly but the staining can be unsightly. The better lights use marine grade 316 stainless and this corrodes, but very much less. The best lights use 316 electro polished stainless steel which will stay bright and clean indefinitely if rinsed from time to time with fresh water.

Keeping water out of the light is just as important as corrosion and if the light is sealed by o-rings it will be better than a light which is sealed by silicon.

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Advice For Lampholder Fitting And Connecting

There are two types of lamp holder: plastic and metal. They may be found as part of a light. The method of connecting  metal lampholder and plastic lampholder  is variety require different considerations.

The first difference to note is that plastic fittings have no earth connection and should therefore only be connected via a two core flex. Metal fittings must always be connected via a flex with an earth wire.

Metal versus plastic lamp holders

The second consideration is that metal fittings are not suitable in some locations – the most notable of which is bathrooms. Plastic ones may be used in bathrooms, but choose the type with a loger plastic shroud which shields the components better.

Switch off the power supply and remove the fuse for the circuit, or, in the case of a table lamp, switch off and remove the plug from the power supply.

Connecting the flex to a lamp holder

Unscrew the fitting to expose the separate components. The construction of metal and plastic ones is a little different as you will notice from the pictures.

Feed the top cover (and retaining pieces in the case of the metal fitting) over the flex and push them along out of the way.

Note the length required for the conductors to reach their terminals.

Cut the outer sheath of the flex accordingly and peel back. Remove the excess with a craft knife.

Separate the conductors and strip the insulation of each back by about 1/2″. Twist the separate filaments of each and connect the brown (live) to one terminal and the blue (neutral) to the other, making sure that they are fed round the supports which prevent strain on the connections.

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Knife switch function and form

knife switch

A knife switch is a type of switch used to control the flow of electricity in a circuit.the knife switch has an insulated handle to grip at one end.

 Current flows through the switch when the knife is pushed into the jaw. Knife switches can take several forms,including single throw, in which the “knife” engages with only a single slot,and double throw.

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Fuse (electrical) Characteristic parameters

porcelain fuse

Speed

The speed at which a fuse blows depends on how much current flows through it and the material of which the fuse is made.Fuses have different characteristics of operating time compared to current, characterized as “fast-blow”, “slow-blow” or “time-delay”.

Breaking capacity

The breaking capacity is the maximum current that can safely be interrupted by the fuse.Fuses for larger power systems must have higher interrupting ratings, with some low-voltage current-limiting high interrupting fuses rated for 300,000 amperes.

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Internet socket

socket

The term Internet sockets is also used as a name for an application programming interface (API) for the TCP/IP protocol stack, usually provided by the operating system.Internet .

Internet sockets constitute a mechanism for delivering incoming data packets to the appropriate application process or thread, based on a combination of local and remote IP addresses and port numbers. Each socket is mapped by the operating system to a communicating application process or thread.

A socket address is the combination of an IP address (the location of the computer) and a port (which is mapped to the application program process) into a single identity, much like one end of a telephone connection is the combination of a phone number and a particular extension.

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Fuse (electrical) Operation

fuse

The fuse ideally would carry its rated current indefinitely, and melt quickly on a small excess.

The porcelain  fuse elements may be shaped to increase heating effect.

The fuse element may be surrounded by air, or by materials intended to speed the quenching of the arc

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The basic description of the fuse

Fuse essential component is a metal wire or strip that melts when too much current flows,which interrupts the circuit in which it is connected.

A fuse interrupts excessive current (blows) so that further damage by overheating or fire is prevented.Fuses are selected to allow passage of normal current and of excessive current only for short periods.

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Flexible metal lamp holder lamp holder and a description of the Earth

Cut the outer sheath of the flex accordingly and peel back. Twistable lamp holder the separate filaments of each and connect the brown (live) to one terminal and the blue (neutral) to the other, making sure that they are fed round the supports which prevent strain on the connections.

Earth for metal lamp holders

The green and yellow earth conductor is fed to this from inside the fitting and secured with the retaining screw.Double check your connections and slide the previously threaded components back down the flex and reassemble the fitting, taking care not to damage or pull the wires in the process.

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Lampholder fitting and connecting types

There are two types of lamp holder, plastic and metal.as a part of a pendant light fitting. The method of connection is similar for both pendant type and table lamp.

but the metal and plastic variety require different considerations.

The first difference to note is that plastic fittings have no earth connection. Metal fittings must always be connected via a flex with an earth wire.

Metal versus plastic lamp holders,The second consideration is that metal fittings are not suitable in some locations – the most notable of which is bathrooms.
knife Switch off the power supply and remove the fuse for the circuit, or, in the case of a table lampholder, switch off and remove the plug from the power supply.

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Lampholder service, innovation, design

We recognize the importance of the lampholder are committed to providing quality products backed by fast and reliable customer service.

we have broadened our product offering beyond Tungsten Halogen to include innovative lampholders for Lampholders.

In addition, our experienced design team can customize standard products to meet your specific requirements.

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