Video- How To Test A Ring Main

by Steve on February 3, 2010

Thanks for Visiting! You can keep up to date with all new content on this blog by by following on Twitter. You can also get instant access to everything via the free Electricians Blog Android App. Please remember that your opinions and comments are always welcome.The UK is one of the few, if not the […]

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Building Regs Part B Fire Safety

by Steve on November 15, 2009

Building Regs  Part B         Fire Safety   Reference to: Building Regs Part B Smoke & heat detectors, wiring & positioning of,  OSG 7.5.2 Emergency Lighting         Also BS7671 Regulation 527 refers to: The Selection and Erection of Wiring Systems to Mimimize the Spread of Fire.     The provision of Fire detection […]

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Smoke Alarm Sensor Types

13 November 2009

    Types of Smoke Alarm Sensor   The following smoke alarm sensor types are suitable for different applications.   Optical or Photoelectric Sensitive to larger smoke particles produced by smouldering fires like furniture.   Suitable for mounting in landings and hallways to reduce false alarms from kitchens but not in steamy areas near to […]

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Building Regs Part F

9 November 2009

Building Regs  Part F          Ventilation Adequate ventilation and installation of the correct siting and sizing of extract fans.   Extractor fans are required in rooms where water vapour and pollutants are present to prevent them spreading to other parts of a building. More information on Extract fans & ventilation .   Find related articles at Electricians and […]

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Electricians and the Building Regulations

8 November 2009

As well as complying with Part P (Electrical) electricians must be aware that they are required to comply with other parts of the Building Regulations.  The Building Regulations are Statutory (Law) and therefore care should be taken to comply with all aspects.   The Scope of Part P of the Building Regulations (England and Wales) The […]

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What is an Energy Efficient Light Fitting?

5 November 2009

What is an Energy Efficient Light Fitting?   As far as the Building regulations are concerned an Energy Efficient Light Fitting can only accept lamps with a luminous efficacy exceeding 40 lumens per circuit watt.   Circuit watts include the power consumed by both lamps and control gear including power factor correction equipment.   A […]

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Power Factor Correction

1 November 2009

    Power Factor Correction Of Linear Loads In the electricity industry, inductors are said to consume reactive power and capacitors are said to supply it, even though the reactive power is actually just moving back and forth on each AC cycle. It is often desirable to adjust the power factor of a system to […]

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KVA to Amps to KVA

1 November 2009

Converting from Amps & KVA for AC installations To Find AC Single-Phase Three-Phase Amps when Kilowatts are known Kw x 1000 Divided by V x pf Kw x 1000 Divided by 1.73 x V x pf Amps when KVA are known KVA x1000 Divided by V KVA x 1000 Divided by 1.73 x V Kilowatts […]

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Disposal of Redundant Lamps

4 October 2009

  Eco Friendly Disposal & Recycling   Why recycle lamps? Recycling specialists Envirogreen say: “Research shows that there are more than 100 million fluorescent and highway lamps used in the United Kingdom each year which produce in excess of 3,100 tonnes of waste material which, until recently, has ended up in landfill sites. Even though […]

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Big Red Book Review

27 September 2009

  Big Red Book Review    BS 7671:2008 What were your thoughts when you first encountered The Big Red Book?   Our Amazon reviewers made the following observations:   1001 ways to use an RCD A murder mystery where people and livestock are getting murdered all across Europe. Only one man can stop it – […]

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Can I issue Part P & Installation Certificates for other peoples work?

8 September 2009

  Can I issue Part P & Installation Certificates for other peoples work? Section 1.28 of Approved Document P DID actually clearly state that a 3rd party may not issue an Installation Certificate. BUT SINCE APRIL 2013 THIS HAS CHANGED An installer who is not a registered competent person may now use a registered 3rd […]

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Revenue Blitz

9 July 2009

Revenue Blitz Contractors are bracing themselves for another sweeping overhaul of the CIS tax system after the government pledged to stamp out bogus self employment.   Very little detail has emerged about Chancellor Alistair Darling’s plan to attack “false self-employment” but some contractors fear it will pile-up extra costs in employers’ national insurance payments.   […]

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Principles

4 July 2009

PRINCIPLES Delve into the nuts & bolts of Electricity The History of Electricity Very Basic Electricity Basic Electricity Principles of electricity A simple generator Is Low Voltage Lighting the same as Low Energy?

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Recessed Downlights

5 June 2009

Recessed Downlights As electrical contractors we regularly install 12 volt recessed downlights and needed to find a reliable and reasonably priced product. We have found that sticking to one familiar core product makes life easier.   When installing recessed downlights the following are essential to us: Knowing the lighting effect created by a particular type […]

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Passionate About Lighting

5 June 2009

  Passionate About Lighting   After enquiring about the new Low Energy Lighting options offered by Aurora, Adam and I were invited by director Stephen Hurrell, to visit the Aurora Lighting Showroom at Welwyn Garden City.   Stephen told us that Aurora was started in 2000 by a group of electricians who wanted to offer […]

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TT circuits require a disconnection time of 0.2 seconds

22 May 2009

  TT circuits require a disconnection time of 0.2 seconds.  (BS7671 Table 41.1). Q How can this be achieved when the Max Loop Imp Tables in BS7671 only deal with 0.4 and 5 seconds?   A BS7671:2008 The note below Table 41.1 states that: TT disconnection time of 0.2 secs up to 32A & 1 […]

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Cables concealed in walls at less than 50mm deep

17 May 2009

Q During Periodic Inspections I often find that cables are concealed in walls at less than 50mm deep and are not protected by RCD. Which Recommendation Code should I give?   A Code 4 (does not comply) Although all installations need to be assessed against the current edition of BS7671, this does not necessarily mean […]

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Where to fit fire rated downlights

10 May 2009

Are fire hoods or fire rated down lights required in every situation? Research was commissioned in 1996 to look into the effect on the fire resistance of plasterboard ceilings with conventional rectangular joists having recessed down-lights installed with no boxing or fire hoods. The results were published in the July 1996 edition of Building Control […]

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Maximum length allowed for final circuits

6 May 2009

  Q   What is the maximum length allowed for final circuits? A   There are many factors which will affect the maximum allowed length of cable runs for final circuits. Calculations must be made to take into account Type of supply Installation (Reference) Method Ambient Temperature Protective Device Conductor Material Volt Drop   But […]

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Bonding in a Bathroom?

4 May 2009

  Q Do I need to carry out supplementary bonding in a bathroom? A Maybe not. On-Site Guide section 8 states that: Supplementary bonding is required by BS7671 701.415.2 in Special Locations.   However, supplementary bonding may be omitted where all of the following conditions are met: Disconnection time of 0.2 for, TT 0.4 for […]

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Bonding on sink?

4 May 2009

  Q Do I need to carry out supplementary bonding on a sink? A Probably not. On-Site Guide section 4 states that: Supplementary bonding is required by BS7671 701.415.2 in some locations. (Generally in Special Locations. A kitchen or utility room is not one of these).   However, if the installation meets the requirements for […]

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TT Systems. Zs reading higher than tabulated

22 March 2009

Q I am measuring a Zs of 140Ω on my final circuits. Table 41.3 gives a maximum of 1.44Ω. I know that a Ze below 200Ω on a TT system is acceptable (Table 41.5 note 2). Is my Zs ok? A Yes it is acceptable. As long as your circuit is protected by an RCD. […]

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TT systems. Bonding in bathrooms

22 March 2009

Q Does the dispensation in Regulation 701.415.2 to omit supplementary bonding in a bathroom apply to TT systems?   A Yes it does apply to TT systems. Regulation 701.415.2 states that supplementary bonding may be omitted where: i) All final circuits in that location comply with 0.4 sec disconnection ii) All final circuits in that […]

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TT Systems. Time-delay RCD main switch

22 March 2009

Q Is a time-delayed RCD main switch required in the consumer unit of a new domestic installation supplied by a TT system?   A Provided that the consumer unit is of all insulated construction and all the final circuits are RCD-protected, a time-delayed RCD main switch is not required. How is 0.2s Achieved? A 0.2s […]

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ECS Gold Card Assessment Exam Revision Notes

23 February 2019

I’ve just passed my ECS Card health and safety exam. So if you’re about to take an assessment, here are some notes to help you in revising for yours. The 30 minute assessment consists of 45 multiple choice questions. To pass the assessment you’ll need to answer 38 correctly. A fee is chargeable to retake […]

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SWA Armouring CSA Sizes Chart

27 October 2018

Use this chart to find the CSA cross sectional area of SWA steel wire armoured cables. It also shows the gland sizes. (Click the table to enlarge) These dimensions should be used for guidance only as steel wire sizes can vary between manufacturers. Rule of thumb is – Always run a cable with integral earth […]

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Best Wired Burglar Alarm

14 October 2018

The best hard wired burglar alarm that we’ve come across is the Texecom Veritas Excel. They’re easy for an electrician or DIYer to install.  Here’s a quick rundown of the benefits and main differences between the Excel and R8 systems. That’s not to say that there aren’t other equivalents or better burglar alarms out there, […]

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What Size Cleat For SWA Armoured Cable-Selection Chart

4 October 2018

What sized cleat to use for which diameter of SWA armoured cable. Here’s our quick selection chart to find the correct size of cable cleat for your SWA. If you know the diameter of your cable you can find the right cleat. This can also be useful when planning holes, cable routes and the size […]

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Electrician Renewable Wind Turbine and Solar Training

19 August 2018

Electrician Renewable Course Qualifications Here’s a rundown of some of the latest renewable course qualifications for electricians. Suitable electrical courses for training or branching out into new sectors.   Wind Turbine Industry EAL Level 2 Diploma in Safe Working Practice in the Wind Turbine Industry Wind Turbine training. This is a Vocationally Related Qualification (VRQ). […]

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18th Edition Electricians Online Training

28 July 2018

How does 18th Edition online training for electricians work? Studying the 18th Edition without missing out on work and at your own pace is an attractive option for many busy electricians. All the training is taken through your browser window. There is no face-to-face sessions with instructors. You can usually revisit the training material at […]

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5 year rentals EICRs following Grenfell Tower fire

21 July 2018

The government proposes to introduce mandatory 5 year electrical safety checks for rental homes. Consultation on building regulations following the review by Dame Judith Hackitt in the aftermath of the Grenfell fire tragedy. The Government has backed introducing a mandatory requirement on landlords with properties in England to ensure that electrical installations in their property […]

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18th Edition Regs Updates

26 March 2018

Here’s an overview of the main changes covered in the 18th Edition IET Wiring Regulations. There are also many additional minor changes throughout the regs that are not in the list below. You’ll no doubt hear about 18th update courses in the coming months. More books and guides coming! BS 7671:2018 Requirements for Electrical Installations […]

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