Showing posts with label solar power wesend glasgow. Show all posts
Showing posts with label solar power wesend glasgow. Show all posts

Friday 5 September 2014

ELECTRICAL CONSUMER UNIT REPLACEMENT

Consumer Unit guide to the 17th edition Wiring Regulations 


For well over one hundred years the Wiring Regulations IN scotland and in Glasgow where we are based, have provided the rules which must be followed to make sure that electrical installations are safe. The introduction of the 17th Edition of the Wiring Regulations on the 1st January 2008 has major implications for all Electrical Contractors Glasgow, Designers and Consultants. Installations designed from 1st July 2008 must comply with this new set of Regulations. Several new Regulations will have an impact upon circuit design and consumer unit layout. This guide below will help you understand the new Wiring Regulations and current Building Regulations, providing the necessary facts to construct compliant installations including Consumer Units. Since 2005 the Building regulations for England and Wales has made direct reference to Electrical Installations, increasing the influence on how Electrical Equipment is installed in buildings.

Building Regulations

Part P of the building regulations relates to the electrical safety in dwellings. The approved document prescribes that consumer units should be located so that they are easily reachable where this is necessary to comply with Part M of the building Regulations.
Part M requires that reasonable provision be made for people to gain access to a building and use its facilities. The approved document prescribes that switches, socket outlets and “other equipment” needs to be at appropriate heights, these are defined as between 0.45m and 1.2m from finished floor level.
Other equipment may be taken to include the consumer unit, as it contains devices such as MCB’s and RCD’s that may need operation or resetting by the user of the dwelling. The consumer unit should therefore be accessible, with the devices mounted at a height no greater the 1.2m above the floor. In addition the consumer unit should not be in a location that would make it difficult to access such as an under stairs cupboard. Neither should it be placed in a position where is likely to be damaged by impact. Therefore depending on the layout of the dwelling a flush consumer unit may be considered.
Consumer Units should be easily reachable and be mounted with the switches at a height of between 0.45m & 1.2m above floor level
Scotland Requirements of 17th Edition Wiring Regulations BS 7671:2008

This section aims to explain some of the new Regulations contained within the 17th Edition Wiring Regulations, regarding the consumer unit and final circuits. Firstly however, to fully understand what is required, we need to consider some definitions from Part 2 of the Regulations.
  • Ordinary Person – Someone who is neither skilled or instructed
    e.g. General public / Home owner
  • Skilled Person – A person with technical knowledge or experience to enable him/her to avoid dangers which electricity may create
    e.g. Qualified Electrician
  • Instructed Person – A person who has been adequately advised or supervised to enable him/her to avoid dangers which electricity may create
    e.g. Facilities Manager
Typically commercial installations will be under the control of a Skilled or Instructed Person. However domestic and some commercial installations will not. This is particularly important, as certain Regulations only apply to installations not under the supervision of a Skilled or Instructed Person. A significant change is the introduction of Regulations requiring additional protection by RCDs. There are 3 points of consideration,
  1. Socket Outlets
  2. Cables buried in walls
  3. Locations containing a bath or shower
together with some other considerations, like the Division of Installation and about the Fire Detection and Fire Alarm Systems for buildings.
Certain Regulations only apply to installations not under the supervision of a Skilled or Instructed Person i.e. Ordinary persons.
The Regulations have introduced new requirements regarding socket outlets, particularly where used by ordinary persons e.g. Home owners.

Sockets Outlets

The definitions for persons are important to consider when we look at the requirements for protection of circuits supplying socket outlets.  Regulation 411.3.3 requires that an RCD of not exceeding 30mA be provided for:
  1. Socket outlets up to 20A that for general use by “ordinary persons”.
  2. Mobile equipment up to 32A that is for use outdoors.
    Exceptions to 411.3.3 are permitted where:
  3. Use of socket outlets is under the supervision of someone “skilled” or “instructed”.
  4. Specifically labelled or otherwise suitably identified socket outlets provided for a particular item of equipment.
This is a change from the 16th Edition that required only socket outlets ‘reasonably expected’ to supply equipment used outside the equipotential zone to have RCD protection e.g. used for an Electric lawn mower. Now under the requirements of the 17th edition it is likely that every socket outlet in a domestic installation will require RCD protection not exceeding 30mA. This may also apply to some commercial installations, like small offices or shops etc where there is no control on the use of those socket outlets. Consideration should also be given to areas where free access to socket outlets is available to the general public e.g. airport lounges.
Socket outlets for general use in a domestic installation require RCD protection not exceeding 30mA
Significant changes affect installations where cables are buried in the wall. This is the normal practice in dwellings.

Cables buried in the wall

Here we need to consider Section 522, Selection and erection of wiring systems in relation to external influences. The particular requirements of this section apply to cables which are concealed in a wall or partition at a depth of less than 50mm, or where metal partitions are used. The definitions for persons are once again important for this section. There are 5 options of installing cables in walls. The cables shall:
  1. Incorporate an earthed metal covering which is suitable as a protective conductor. Eg SWA cable.
  2. Be enclosed in earthed metal conduit, such that is suitable as a protective conductor.
  3. Be enclosed in earthed metal trunking, such that is suitable as a protective conductor.
  4. Be protected against damage from penetration by nails or screws.
  5. Be installed in a safe zone.
This is much the same as the 16th Edition requirements and the usual option is to install cables in a dedicated safe zone. However, where an installation is not under the supervision of someone skilled or instructed, regulation 522.6.7 applies. In this regulation where (5) only from above is used then the cable must have additional protection by the use of a RCD not exceeding 30mA. This would apply where thermoplastic (PVC) wiring systems are used, this is typical in most domestic installations and some commercial installations.
Where buried cables are not mechanically protected additional protection by an RCD not exceeding 30mA must be provided
Although additional regulations relating to bathrooms etc are not new, there are some important changes to consider.

Section 701, Locations containing a bath or shower

Regulation 701.411.3.3 requires that all circuits within this location shall be additionally protected by an RCD not exceeding 30mA. This would mean 230V lighting, the 230V supply to the source for SELV, a shower circuit and bathroom heater for example will all need RCD protection. A standard 13A socket outlet is now permitted in this location provided however the socket outlet is more than 3m from the boundary of zone 1.
The 16th Edition required local supplementary bonding be provided connecting together all exposed and extraneous conductive parts in the zones. This is no longer required in this location provided the following conditions are met:
  • All final circuits of the location comply with the automatic disconnection requirements according to regulation 411.3.2.
  • All circuits are RCD protected in accordance with 701.411.3.3.
  • All extraneous-conductive parts of the location are effectively connected to the protective equipotential bonding according to regulation 411.3.1.2 (Previously termed main equipotential bonding).
All circuits in locations containing a bath or shower shall be protected by an RCD not exceeding 30mA

Qualified electricians paisley Other Considerations

There are additional Regulations and Codes of Practice that need to be considered during the design of an installation. These will affect the choice of consumer unit.

Division of Installation

Section 314 calls for the installation to be so divided to:
  1. Avoid hazards and minimize inconvenience in the event of a fault
  2. Reduce the possibility of unwanted tripping of the RCD due to excessive protective conductor currents.
To comply with these requirements the circuits of an installation should not be connected to a single RCD, as this could lead to loss of supply to the entire installation in the event of a fault on one circuit, clearly inconvenient for the user of the building.
All circuits of an installation should not be connected to a single RCD
The Wiring Rules & Building regulations are not the only documents that need to be consulted, another important document relates to smoke alarms.

BS 5839-6:2004 Fire detection and Fire alarm systems for buildings

This Code of Practice has particular requirements for dwellings. This document makes reference to the power supply to such systems and mentions RCD’s. The circuit supplying these systems should preferably not be protected by an RCD. This however is going to be difficult to achieve if the circuit supplying these systems is buried in the walls and standard domestic wiring systems are used. Indeed the supply cables would need to be specially protected in earthed metal conduit etc. for RCD protection not to be used.

Sunday 27 January 2013

Solar panels


Tasked with a mandate to source 50% of the energy required for its shore-based operations from renewable sources by 2020, the U.S. Marine Corps (USMC) turned the construction of Bachelor Enlisted Quarters (BEQs) into another opportunity to advance on this goal. With excellent solar resources at Twentynine Palms, California, the USMC selected solar power for their Marine Corps Air Ground Combat Center and enlisted Baker Electric Solar to install a 1.5 MW solar system. However, there was one stipulation: solar panels couldn’t be installed on any BEQ rooftop.
 
Up to the challenge, Baker Electric Solar turned an amphitheater, parking lot, and parking garage into dual-purpose solar systems. Due to space constraints, SunPower high-efficiency solar panels were chosen because they were the only commercially available panels that could meet the military’s energy requirements. Completing an estimated six-month project in only two months, Baker Electric Solar’s ingenuity, attention to aesthetics, and overall installation quality earned the project SunPower’s prestigious Intelegant Award for Excellence as well as an award from the Solar Electric Power Association (SEPA) and the Solar Energy Industries Association® (SEIA). With this award-winning solar solution, the USMC is one step closer to their energy goals and can look forward to saving $3.2 million over the next 25 years.
This is a quick look at companies in the Usa USing solar power but it will be more and more present in Glasgow over the coming years
 
PROJECT CHALLENGES DRIVE INNOVATION
Located in the Mojave Desert, the USMC base at Twentynine Palms was ideally located to turn sunlight into electricity. Consequently, solar power was included as part of the design of the BEQ-9 construction project, which featured three 4-story BEQs, a landmark projection tower, an outdoor amphitheater, and a parking garage. However, the opportunity brought with it the challenges of extreme heat and wind storms. In addition, the USMC’s request for proposal (RFP) included restrictions on where the solar panels could be placed. To address the extreme conditions and space restrictions, Baker Electric Solar created two work shifts using two different crews each day to maintain productivity in high heat, developed an attachment clip to better secure the panels against extreme winds, and turned the amphitheater and other buildings into dual-purpose structures by integrating solar panels into the existing design.
 
SUNPOWER OVERCOMES SPACE CONSTRAINTS
Advanced 3D modeling helped develop a design that successfully integrated the solar system with the available structures, but a regular-efficiency solar panel still couldn’t meet the RFP’s electricity production requirements. “The only way we were able to achieve the capacity that the military required was to use the highest-efficiency panel on the market. The SunPower modules were really the only way of getting it done,” said Baker Electric Solar’s Solar Project Development Engineer Quinn Laudenslager. By incorporating SunPower solar panels, Baker Electric Solar was able to design and install a system that not only met the base’s energy specifications, but will also save the base more than $3 million in electrical costs.
 
MARINE CORPS PROJECT WINS AWARDS
In two short months, Baker Electric Solar met all the RFP requirements and completed the BEQ-9 solar project. BES also integrated a monitoring system into the base’s existing building management system, enabling quick and easy review of the solar system’s performance. The innovation, aesthetics, and high quality of this USMC solar project have garnered several awards, including the 2011 SunPower Intelegant Award for Excellence and a 2012 Photovoltaic Project of Distinction Award conferred by SEPA and SEIA. The BEQ-9 project is also registered for Leadership in Energy and Environmental Design (LEED) Platinum, which highlights the overall environmental commitment of the USMC. While these accolades are great, the bottom line is that the Marine Corps base can look forward to substantial energy cost savings for the next 25 years and are another step closer to achieving critical renewable energy objectives.
 

Ensuring Safe Homes: The Imperative of Electrical Testing, Qualified Electricians, and EICRs for Landlords in Glasgow

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