17th Edition Exam

Prepare yourself for the 17th edition electrical exam with some past exam papers. They will help you to know what to expect in the exam and help you bookmark your IET wiring regulations BS7671 handbook where the questions will come out of. Bookmarking your handbook will also help you look up the answers quickly when doing the test as its an open book test.
Some questions in the exam are:
1. For a TN-S system the maximum permitted disconnection time for a socket outlet in a domestic kitchen is
a. 100ms
b. 400ms
c. 6000ms
d. 8000ms
2. A method of fault protection for low voltage portable or mobile equipment is automatic disconnection of the supply within
a. 0.4 s with no other restriction
b. 5s using 110V mid-point earth transformer
c. 10s
d. 10 s but using 110 V supply.
3. The external loop impedance (Ze) value can be found by either enquiring from the local electricity board or taking an earth loop impedance reading at
a. The supply point and subtracting the value of internal loop impedance (R1 + R2)
b. The furthest socket outlet from the supply
c. The origin of supply
d. Both the supply and at the furthest socket outlet and subtracting one result from the other.
4. When you use a non-metallic hand-held piece of equipment or appliance, temperature of any accessible part in degrees Celsius must be no more than:
a. 30
b. 45
c. 55
d. 65
5. Proper co-ordination between conductors and an over-current protective device is obtained when
a. In is less than Ib
b. In is less than Iz
c. Iz.-12 =1.45
d. I2xl.45 = Ib
If you follow these guidances on how to prepare for the 17th edition exam papers, you will be bound to pass it with flying colours.

When wiring a consumer unit you need to first look at the earthing arrangement of your supply. Is it a TN-S, TN-C, TN-C-S or a TT earthing arrangement supply? The maximum disconnection time for your Residual Current Device for a TN-S earthing arrangement supply must be 100ms. So its important to know the supply in order to know how to wire a consumer unit and the earthing and bonding connected to it.

A TN-S supply has a separate earth and neutral to the service head in your property where as a TN-C system as the earth and neutral combined and would require the installer to add an earth rod as an additional earth to the supply.
Where a Prospective Fault Current exceeding 30 kA exists at the origin of an installation, it is strongly recommended to use a Residual current device as the main point of isolation in the Consumer Unit.

The best earthing arrangement for domestic properties which is also commonly found in urban areas are PME systems or as standard referred to as TN-C-S. You will need to inspect the service head well before identifying which earthing arrangement your property you are working on has. This will determine how you will connect your earthing and bonding conductors.

I wired up my first consumer unit when I was qualified as an electrician 15 years ago. Wiring a consumer unit is not as hard as it looks . Yes, there can be a load of wires initially sticking out that needs connecting up. But in truth if the wires that was pulled in for all the circuits was labelled up properly, it should not be difficult. A qualified and self respected electrician would do that. All radial circuits will only have 3 wires coming in and a ring main circuit will have 6, Live neutral and earth. All the earths will be connected on the same connector block or bus bar and all the neutrals on the same connector block or busbar inside the consumer unit. The lives get connected to the individual MCB’s or RCBO’s. Make sure that if its a split load consumer unit that all the neutrals from all the circuits before after the RCD needs to be connected separately together.

When selecting a consumer unit to buy for installation, always go for the well known brands like Crabtree, MK, GE and so on. They are much better laid out and bus-bars are easier to work with. Having a consumer unit that is cheap may frustrate you tremendously when wiring it up.

Approximately 90% of the devices in and around our homes uses electricity to function. Electricity is one of the biggest evolutionary key discoveries by humankind. Electrical devices do fail occasionally due to the natural stresses electricity puts on a device. Heat, vibration, and so on. When an electrical device fails, we have a tendency to do three things. Either we call out an electrical engineer to fix the item or we may seek out the help of our inherent experience to mend the item. Alternatively we might throw the item out and buy another.

Some people are born with that special ability to fix anything by themselves. Give them any broken electrical device and they will fix it within hours. Unfortunately the rest of us will have to seek the aid of a qualified electrician.

If you’re capable to fix such devices it would save you pounds. It’s critical to stress the following. You need to only attempt to fix an electrical device by yourself when you have the experience or capability to do so. A lack of experience will cause many issues and can cause serious injury or even death.

Electrocution is the first issue and often can be deadly. Don’t try to fix it all by yourself unless you know what you have to do or have been taught how to handle an electrical device. A lot of individuals that initiate the fixing process would forget the fact that the device is still connected with the primary power supply. Without realizing this fact, they may touch exposed live parts inside the device, leading to electrocution. Naturally wearing rubber gloves and shoes will lower the possibility of being shocked.

Specialised tools are required to perform the electrical repair. A trained electrical engineer, from a different perspective, will know the way to go about. He would always have the correct tools. To establish the flow of electricity he would use a device called an electrical tester or multimeter. He can use this device to check whether stray electrical currents are flowing through assorted parts of the machine and determine what parts are Live.

Majority of electricians and electrical companies have their own custom websites. In it the electricians will list various aspects of their expertise and the type of work they would take on. This is presented to the visitor so they will have an idea about the capabilities of the electricians and the company.

Not all electricians provide an emergency electrical service and this information can often be found on their website. Sometimes, for corporate purposes electricians might work in unison. Many reputable electrical companies that are found on the Internet are known to employ electricians who are capable and efficient at the same time.

Learn More about Electrical Symbols

Electrical symbols are widely used in the electrical design industry but do not form part of the 17th Edition wiring regulations test. You will though need to know how to read electrical drawings and know what electrical symbols mean on them. You sould get familiar and get an introduction to electrical symbols when you do your City & Guilds 2330 qualification.

To know your symbols is important as well when trying to fault find electrical faults from drawings. Understanding the drawings is key. To understand electrical circuits is cruisial in the bigging of your electrical studies and its probably one of the first thing you will get involved with when doing your qualification.

Find descriptions for electrical symbols and wiring regulations on the internet with a quick search.

To be an electrician is not for the faint hearted. You need to work on the side of safety and follow safe procedures but to be an electrician can sometimes be a risky job.

You need to be able to take risks in an orderly manner and be able to work with live wiring. To work with live wiring can be done in a safe manner with the correct equipment and safety gear. Insulated gloves, insulated screwdrivers rated to 1000V and long tools to use where its not advisable to put your hands in, for instance long nose-pliers.

Approach your Electrician Essex for an electrical apprenticeship to become a fully qualified tradesman.

Someone called me the other day that was interested in buying the 17th Edition Exam Papers on our website. His main concern and reason he was interested in the papers was to know if these questions in the 17th Edition past exam papers where the same that would appear in all 17th Edition Exams.

The answer to that is yes and no. Many Of the questions are of similar structure and nature. They may not be asked in the same way but they would cover the same topic as previous 17th Edition exam papers. The questions would cover the same section of the 17th edition Wiring Regulations.

My personal recommendation on using past 17th Edition Exam papers is to bookmark the questions in the Wiring Regulation as this is where similar questions will be coming from. Remember that the test is an open book test.

In order to become a London Electrician you will need to obtain the right qualifications. You not only have to do an apprenticeship but will need to have completed the appropriate subjects and qualifications at an approved college. You will need to do your 17th Edition Wiring Regulations BS7671 City and Guilds 2382 and City and Guilds 2391: Inspection and testing.

This will allow you to do electrical installation work as electrical contractors in London. The competition in London for good electrical services is very high and to survive in the market you will need to deliver a good reliable one.

Do not be tempted to take shortcuts!!!