Safety Considerations and Regulations – EI WR Ass2
Task One – P3.
1) Bathrooms are sub-divided into separate zones; with the aid of a neat, well-labelled diagram explain the meaning of these zones. It is essential that all dimensions are included and all zones (0-2) are defined.
Zone 0 – Usually within a bath or shower, if any electrical equipment is placed here it would need an IP rating of IPX7 at the minimum to be accepted.
Zone 1 – Found above a bath and within a shower, electrical installations here must have a minimum IP rating of IPX4.
Zone 2 – Outside of a bath or shower or above a set of taps, the minimum IP rating that can be used is again IPX4.
2) What type of light switch can be used in any sized bathroom?
A pull cord light switch can be used in and any size bathroom, using a pull cord eliminates the risk of an electric shock due to wet hands after coming out of the bath or shower.
3) A conventional one-way wall mounted light switch could be used in a bathroom under what conditions?
A conventional one-way wall mounted switch can be used for bathroom lighting as long as it is placed outside the bathroom, e.g. the outside wall or just outside the door.
A plate switch should be at least 0.6m from the edge of a bath or shower and must be suitable for the locations, according to BS76721: 2008/2013.
4) Why is a shaver point allowed to be used in a bathroom?
A bathroom shaver point is allowed to be used in a bathroom as they use an isolating transformer, with an isolating transformer, the wires are ‘floating’. The full mains voltage is still between the wires but they are both ‘isolated’ from earth. The isolating transformer in the bathroom outlets is small and will only supply current for low power devices.
5) What zone and provision must be made to allow a shaver power point to be located in a bathroom?
The shaver point should be located in Zone 2, if it has an IP rating of IPX4, however, it would be better for the shaver point to be outside Zone 2 as there would be no risk of water getting into the socket and causing an electric shock.
6) Can an electric socket outlet be placed in a bathroom, state the relevant regulations that control this type of installation?
According to BS7671 ‘Requirements for electrical installation,’ an electric socket can be placed in a bathroom as long as it complies with BS7671, within the standard section 701 which divides the bathroom into different zones which take into account windows, doors, walls, ceilings and partitions based on a perceived level of risk.
7) Define the term IP rating.
IP ratings (otherwise known as Ingress Protection Ratings) are defined in BS EN60529: 1992. ‘An IP rating classifies and rates the degree f protection against intrusion (body parts such as hands and fingers) dust, accidental contact and water by mechanical casings and electrical protection.’
8) List three types of electrical equipment that has an IP number.
· Fluke 28 II digital multimeter.
· Shaver socket.
· Extractor Fan.
9) State and explain typical IP numbers for the three pieces of equipment listed in questions 8.
· Fluke DMM – IP67
· Shaver socket – IP41.
· Extractor Fan – IPX4
Task Two – P8.
Describe the statutory and non-statutory regulations that apply to an electrical installation on the inside of a building.
There are many statutory regulations that apply when doing an electrical installation inside a building, such as the Health and Safety at Work Act, this is a primary piece of legislation that cover occupational health and safety and it is enforced by the Health and Safety Executive (HSE), local authorities and other enforcing authorities relevant to the working environment.
The HASAWA states that all employers and employees must comply with all relevant Health and Safety procedure, it also gives a list of general duties of employers and employees, the general roles, powers and duties of the HSE. It shows the enforcement of the HASAWA and how to obtain and disclose information and what information should be disclosed.
Another statutory regulation that applies to an electrical installation inside a building, are the Building Regulations 2000. This includes parts B which refers to fire safety in both residential and non-residential buildings.
Part B includes information on Fire Alarms/Fire Detection, Escape Routes, Load Bearing Structures, Wall and Ceiling Linings, General Provisions, Protection of Openings (such as pipes) and Fire Stopping Measures.
A third statutory regulation is an Electricity at Work Regulation 1989, Regulation three places duties on the employers, employees and self-employed – to comply with the regulations as far as matters are under their control. It places duties on employees to co-operate with their employers. Regulations 5 to 14 refer to electrical equipment, working with both live and dead electricity, the suitability of the wires used along with their connections and the earthing connections.
A fourth statutory regulation is GS38 which refers to test leads supplied with some equipment.
“GS38 is a guidance document produced by the Health & Safety Executive when dealing with electrical test equipment. It states that test leads must satisfy certain criteria in order to comply with GS38 regulations.”
Under GS38 test leads, used to measure or apply voltages over 50Vac and 100V dc should have:
· Fused leads
· Shrouded connectors
· Finger barriers
· Identifiable leads
· Insulated flexible and robust leads
· Minimum of 4mm exposed tip (recommended 2mm, spring loaded).
The fifth of the statutory regulations that must be complied with is the Safe Working Practises regulations. Safe Working Practices state that before working on any electrical equipment the employee must decide whether it is safe to work live or whether to work dead.
It also states that before beginning work employees must obtain permits to work. Safe Working Practices must be implemented using:
· A communication plan to inform workers.
· A training plan to outline who needs training, how much training is needed and the time required.
· An orientation plan for new and returning workers and for workers who change jobs/roles.
· A process for ensuring compliance.
· A review procedure.
· The use of PPE.
· The use of risk assessment before beginning a job.
· Manual Handling, Working at Heights, Stress Awareness, COSHH, Screen Equipment and Desk Placement, Safety Signs and Signals training.
The final regulation that applies to an electrical installation inside a building is non-statutory, BS7671 can’t be guaranteed as statutory as it doesn’t comply with all of the relevant statutory regulations. BS7671 refers to Building Regulations, Health and Safety at Work, Electricity at Work and the Wiring Regulations.
Task Three – P9.
Describe the statutory and non-statutory regulations that apply to an electrical installation on the outside of a building.
Task Four – M2.
1) Define the terms BASIC and FAULT protection.
2) Explain and justify the steps taken to prevent electric shock by implementing fault protection methods.