Understanding the practical procedures for overseeing and

organising the work environment (Electrical Installation)

Aims & outcomes:

At the end of this session, learners will have an understanding of:

The types of technical and functional information that is available for the installation

of electrotechnical systems and equipment

Terminology for electrical equipment

Monitoring of personnel & site security measures

Temporary site supply requirements

Health and safety responsibilities and communication on site

Required competencies and contract documentation

Planning work activities

Take-off sheets/materials lists, time sheets, variation orders,, purchase orders,

delivery notes, critical path network, storage and methods of handover

• Manufacturer’s documentation and catalogues

• Wholesaler catalogues and pamphlets • Manufacturer’s data/websites • Advertising materials/posters/commercials • Product books and catalogues

Documents that will assist in the design and construction of electrical installations. Information the client might use during the design.

• IET Wiring Regulations BS7671 • Drawings –layout diagrams • Wiring/circuit diagrams • Site plans • Designer specifications • Manufacturer’s documentation and instructions • Materials lists – Take-off sheets • Architects drawings

Documents that could be used by the installer/contractor:

• Protective measures required for the installation eg. RCD, ADS, type earthing system, Class II • Type of finish and style for accessories –

white/brass/stainless/chrome/brushed/polished • Type of mounting – surface/flush • Use of the equipment • Detail the manufacturer of accessories

Information that may be found on a specification:

Consumer Unit Terminology:

Consumer Unit Terminology: Module - one single device that will occupy one standard width or one way in a CCU (fuseboard), for example a single circuit breaker is one module. An example for two modules would be the ‘main switch’ as it takes up the width of two single modules or two ways. So a single module RCBO will occupy one single way and a 2 module RCBO will occupy two ways in width. A single module would normally be single-pole and two modules double-pole.

Consumer Unit Terminology: Busbar - a strip or bar of copper, brass or aluminium that conducts electricity within a consumer unit, distribution board, substation or other electrical apparatus. Its main purpose is to conduct a substantial current of electricity, and not to function as a structural member. To simplify, it is the copper bar which links the consumer line terminal of the main switch to the incomer side (normally the bottom) of the circuit breakers/fuses.

Consumer Unit Terminology: Ways – How many circuit breaker and RCD/RCBO modules can be installed on the busbar within the consumer unit Split-load – Two or more groups of circuits separately or individually controlled by individual RCDs having separated neutral bars, bus bars, and line terminal connections allowing individual group isolation Din rail – A ‘normally’ metal rail used for mounting circuit breakers inside the consumer unit

Consumer Unit Terminology: Circuit list / schedule - a legible chart, list or schedule detailing the designation of each circuit breaker, fuse or RCD within a Consumer Control Unit.

• Sign-in book • Visitor’s book • Emergency evacuation – ensuring everyone is

accounted for and safe/registers/roll call • Site security/safety records

Monitoring of personnel on site:

• Site diary – records work activities on a daily basis/records any delays and the reasons for/recording receipt of variation orders

• Variation order – written confirmation of a variation on the agreed contract

• Time sheets – Details the hours worked by the workforce

• Daywork sheets – Records work done that is in addition to the agreed contract

Documents for recording work done:

Maintaining safety on site: • Create and review risk assessments

Maintaining contract cost effectiveness: • Minimise wastage and careful ordering of materials,

minimise plant hire times etc.

Ensuring work is kept on programme: • Work well with others and communicate with

responsible parties such as the site manager regularly monitors progress.

Relevant industry standards on site: • Health and safety i. Health and Safety at Work Act, PUWER (Provision and Use of Work Equipment Regulations)

• Electrical installation work i. Electricity at Work Regulations, BS7671

• Records, drawings and data used during and on

completion of electrical works i. CDM Regulations, BS7671 • Employee rights and responsibilities i. Sex discrimination Act., Employment Rights Act

Critical Path Network The (CPN) is an acronym for ‘Critical Path Network’, which is a system for scheduling a set of project activities. It is an extremely important tool for effective project management. Most tasks will have some leeway or flexibility on their start and finish times known as ‘float’. There generally will be one path through the network with ‘no float,’ so that any slippage on any one activity could cause the entire project to be late. This is the critical path.

• Bar charts – Gantt charts • Spreadsheets • Critical Path Network – coordinates labour and

trades on-site

Documents used to coordinate work:

• Temporary site supply transformer – 110V RLV (Reduced Low Voltage) • Generator – 110V • You can use 230V provided it is protected by an

RCD – IΔn = 30mA

What sort of temporary supplies would be used on site:

Suitable qualifications and recognised professional Bodies

NICEIC National Inspection Council For Electrical Installation

Contracting - is the UK's leading voluntary regulatory body for

the electrical contracting industry. It has been assessing the electrical competence

of electricians for over fifty years and currently maintains a roll of over 26,000

registered contractors.

PASMA Prefabricated Access Suppliers' and Manufacturers'

Association) - a well known industry association focused on the

safe use of mobile access towers and promoting best practice in this area.

JIB Joint Industry Board - sets the standards for employment,

welfare, grading and apprentice training in the electrical contracting industry.

C & G City and Guilds Examinations Awarding Body

CV Curriculum Vitae - gives an overview of a person's experience

and other qualifications. In some countries, a C.V. is typically the first item that a

potential employer encounters regarding the job seeker and is typically used to

screen applicants, often followed by an interview, employment.

Drinking water or potable water is water safe enough to be consumed by humans or used with low risk of immediate or long term harm.

How can the contractor conserve water during the construction of the installation?

In most developed countries, the water supplied to households, commerce and industry meets drinking water standards even though only a very small proportion is actually consumed or used in food preparation.

How can the contractor conserve water during the construction of the installation?

Typical uses (for other than potable purposes) include toilet flushing, washing and landscape irrigation.

How can the contractor conserve water during the construction of the installation?

Grey water gets its name from its cloudy appearance and from its status as being between fresh, potable water (known as “white water”) and sewage water (“black water”). In a household context, grey water is the leftover water from baths, showers, hand basins and washing machines only.

How can the contractor conserve water during the construction of the installation?

Some definitions of grey water include water from the kitchen sink. Any water containing human waste is considered black water. In reality, only rain water and that collected from on-site washing facilities could potentially be used.

How can the contractor conserve water during the construction of the installation?

Water is of paramount importance within CEMEX everyday operations and a key input in the production process of cement.

Additionally, water is a primary component of concrete, representing an average of 15% of the mixture..

It is also used for cooling and preparing slurry for cement, washing aggregates, and cleaning plant and equipment, including concrete delivery trucks.

Therefore water emissions need to be carefully controlled in order to increase water efficiency and recycling.

Protecting the installer from the harmful effects of dust:

Ventilation: • Open windows – try to get a through flow of

air • Use forced air extraction and filtering • Use vacuum cleaner fitted to machine

Protecting the installer from the harmful effects of dust:

PPE • Dust mask • Respirator • Goggles • overalls

Protecting the installer from the harmful effects of dust:

Dust damage: • Dust sheets

Information/documentation to be given to the client on completion of the contract:

• Invoice • Electrical installation certificate including schedule

of inspections and schedule of test results • Manufacturer’s instructions/manuals • Demonstration – explanation of systems function • As fitted drawings • Wiring diagrams • Manufacturer’s warranties

Construction site portable equipment

Site transformers (RLV) Reduced Low Voltage transformer 110V

230V

L

N

55V

55V

110V

Primary Secondary

Extension leads:

• 110V = Yellow • Arctic grade PVC insulation • Can withstand low temperatures

without becoming brittle

Hand-held lamps:

• SELV – 12V – 24V

• Battery

• No Earth – Class II symbol

v v

Site security:

Site storage:

Communication between employees: • Informal verbal between co-workers • Formal verbal with supervisor

• Providing layout diagrams for positions of

equipment within a location • Establishing progress of work whilst off site by

contacting supervisor via telephone, e-mail or text.

• Asking colleagues or co-workers for help if

necessary eg. manoeuvring equipment into positions within a kitchen.

• Written invitations to contractor • Written invitations to tender • Site meetings on a regular basis • Information signs displayed • Information leaflets and letters • Local advertising • Verbal requests to other trades on site

Methods of communication on site:

• Proof of qualifications eg. Inspection and testing City & Guilds 2391 or equivalent

• CV (Curriculum Vitae) past and previous employment references

• Health & Safety awareness – JIB card, ECS, CITB, CSCS card

• Appropriate qualifications: City & Guilds 2360, 2330, 2357, Domestic Installer scheme, Part P, equivalents.

• Various competency schemes, previous experience, holds competency scheme card.

Operative and workforce competence:

• Manufacturers documentation • Variation order, written • Written reports for findings on site • Explanation of operation of equipment on

handover to client • Site meetings with all relevant parties to

resolve problems on site

Methods of providing technical information:

• Helpful • Polite • Clean, well presented, smart • Professional approach • Friendly • On time!

Customer relationship promotion:

• Late delivery of materials • Weather conditions • Availability of personnel, materials, plant • Client cash flow issues • Extras • Additions or variations

Contract completion date extension allowance factors:

• Enables problems to be identified and adjusted to suit

Critical path network:

• A full and complete materials list needed taken from drawings

‘Take off’ sheet:

Take off, sometimes spelled as "take-off" or "takeoff," is a part of the cost estimating process in the construction industry. Estimators use construction blueprints, either manually or electronically, and start "taking off" quantities of items they will need from those blueprints in order to prepare part of the estimate. Examples of possible take offs include the number of light fixtures needed in the building plan or the amount of wiring needed for the electrical work. Take off happens in different ways: Some do manual takeoffs from field sketches, some do on-screen take offs using estimating software programs, and some use digitizers, which are electronic measuring devices that work on hard copy plans.

On Completion and initial verification of an electrical installation: Electrical Installation Certificate Schedule of Inspection Schedule of Test Results

• Load (kW) Power rating • Dimensions (Size)

Relevant but of less importance: • Colour • Type • Design

Technical information required before installing equipment:

Arrangement of distribution circuits can be shown by the use of: • Block Diagrams • Circuit diagrams • Wiring arrangement diagrams/plans • Circuit charts and schedules