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RCBO for old Square D distribution board

Hi, A relative has moved into a flat with a mid-80's Square D QO1 12F distribution board, which has MCBs on all outgoing ways. There are proposals to update the kitchen with a desire for some additional socket outlets. To meet the requirements of Part P and by extension, BS 7671, RCD protection...
- soms
- Thread
- Nov 17, 2018
- board distribution distribution board old rcbo square
- Replies: 21
- Forum: UK Electrical Forum
Depth of chases and knock out boxes

Hi, I would be interested to hear the opinion of the seasoned/experienced members on the following: Approved Document A tells us the maximum depth of vertical and horizontal chases in walls and that chases should not impair the stability of the wall in order to comply with Part A of Schedule 1...
- soms
- Thread
- May 18, 2018
- boxes depth out
- Replies: 9
- Forum: Electrical Course Trainees Only
Maximum permitted Zs values for circuits with TT earthing system

Hello, I am assisting my supervisor and getting some first hand experience of completing certification by filling in an electronic copy of an EIC, working from a handwritten circuit schedule with test results and my memories of the installation work. I am at home so cannot ask him for advice...
- soms
- Thread
- Mar 20, 2018
- circuits earthing maximum permitted system values
- Replies: 4
- Forum: Electrical Course Trainees Only
Earth loop impedance measurement affected by dimmer switch

Working on a job today which included a very simple new lighting circuit. The lighting circuit a very short run from a distribution board to a single switch position, which then supplies a single luminaire. The customer wanted a dimmer switch to control the fitting. To crack on and perform the...
- soms
- Thread
- Aug 17, 2017
- dimmer dimmer switch earth impedance loop loop impedance measurement switch
- Replies: 8
- Forum: UK Electrical Forum
Volt drop calculations - a couple of questions

Hi, I currently am working on some cable sizing calculations for an exercise in which we apply our knowledge and use of the OSG. We have a ficticious single-phase, light commercial installation for which we have designed the circuits to supply a range of requirements and loads. We have selected...
- soms
- Thread
- May 4, 2016
- calculation calculations circuit circuits couple current questions volt volt drop volts
- Replies: 4
- Forum: Electrical Course Trainees Only
Hi

Hello, Presently in the process of broadening my knowledge, particularly in the theory and regs side, maybe looking towards undertaking some suitable electrical qualifications in the future. Came across the forum which seems to discuss some interesting topics!
- soms
- Thread
- Mar 3, 2014
- Replies: 2
- Forum: The Welcome Forum

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