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Electrical Warning Signs & Labelling

Common electrical warning signs and labels that you might find attached to electrical equipment.

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	Earthing clamps Bondings to metal pipes are made with earthing clamps to BS951. A permanant label is required to be fixed into position at or near: The point of connection of every earthing conductor to an earth electrode or other means or earthing, and To the point of connection of every bonding conductor to an extraneous-conductive-part, and At the main earthing terminal where it is seperate from the main switchgear.
	Switchgear and controlgear Unless there is no possibility of confusion, a label indicating the purpose of each item must be fixed on or adjacent to the switchgear or controlgear. It may be necessary to label the item controlled as well as the controlgear. Distribution Boards & Consumer Units Each protective device e.g. a fuse or circuit breaker must be arranged and labelled so that the circuit protected can be easily identified.
	Isolators As well as being clearly identified switches used as isolators must also indicate the circuit or circuits that they switch. Equipment supplied from more than one source Certain equipment may require the operation of more than one switch in order to make it safe. In such a case a durable warning notice must be permanently fixed in a visible position to identify the appropriate devices
	Periodic Inspection & Testing A notice of durable material indelibly marked with the words as on the left must be fixed in a prominant position at or near the origin of the installation. The notice records the date of the last electrical inspection and shows the recommended date for the next inspection.
	Residual Current Devices (RCDs) Where an installation incorporates an RCD a notice must be fixed in a prominant position at or near the installation. The notice prompts the owner of the installation to test that the RCD functions correctly.
	Warning notice: Non standard colours If alterations or additions are made to an installation so that some of the wiring complies with the harmonised colours and there is also wiring in the old colours, a warning notice must be affixed at or near the appropriate distribution board.
	Unexpected presence of nominal voltage exceeding 230 V Where the nominal voltage exceeds 230 V to earth or 400 V between lines a warning label stating the maximum voltage present must be provided where it can be seen before gaining access to live parts. Nominal voltage exceeding 230 V (U or Uo) between simultaneously accessible equipment For simultaneously accessible equipment with terminals or other fixed live parts having a nominal voltage (U or Uo) exceeding 230 V between them, e.g. 400 V line to line, a warning label must be provided where it can be seen before gaining access to live parts. Presence of different nominal voltages in the same equipment Where equipment contains different nominal voltages, a warning label stating the voltages present must be provided so that it can be seen before gaining access to live parts.
	Diagrams A diagram or schedule must be provided showing: The number of points, size and type of cable for each circuit The method used to provide protection from indirect contact. The information necessary for the identification of each device performing the functions of protection, isolation and switching and it's location. Any circuit vulnerable to an insulation test. Circuits that may be vulnerable to an insulation test would be those that have solid state devices such as burgalar alarms, fire alarms, central heating controllers, solid state transformers etc

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Electrical Installation and Testing Services

If you are looking for a reliable and experienced company to carry out any kind of electrical installation, testing or maintenenace work, we can help.

We have specialist knowledge at your disposal and ongoing experience with designing, installing and testing single and three phase elecrical systems including those utilising and incorporating stand-by generators, storage batteries, UPS Systems, DC systems and pumps. We deliver practical energy generating, energy saving and modern electrical solutions for private, commercial, trade and agricultural clients. With engineering offices in Swindon and Torquay and electricians on the road, we service clients all over Southern and South West England and into the West Midlands.

Electrical Installation & Testing Services

 

Articles

Further reading and calculators related to designing, installing, repairing and maintaining solar photovoltaic and electrical systems:

Mains Power Supplies & Earthing Systems

Mains Supply and Earthing Systems: Location & accessability, supply systems, earthing, bonding, labelling, installing RCDs.

Types of Solar Photovoltaic (PV) System

Introduction to the different types of Photovoltaic (PV) System available including Grid Tied, Off-Grid, Hybrid and Batteryless solar PV systems.

Engineering Recommendation G98

Grid Connections for Micro-Generators including Solar PV Systems and Elecricity Storage Systems in the UK. Under 16Amps Per Phase, grid synchronised.

Solar PV System Components

Overview of the basic components needed to install a complete solar PV system. Introduction to solar PV panels. power inverters, AC & DC isolators and mounting systems.

Free Solar PV Calculators

A list of free solar PV calculators, solar design tools and software, Use to calculate solar yields and the Return on Investment (ROI) for solar PV systems.

Solar PV: Smart Export Guarantee

Interesting times ... The Smart Export Guarantee came into affect in January 2020. The Smart Export Guarantee is an obligation set by the government for licensed electricity suppliers to offer a tariff and to pay small-scale low carbon Generators and Micro-generators for any electricity that they export to the National Grid.

Evaluating Solar PV Panels - Which panels to buy?

What to look for when evaluating and selecting solar PV panels for UK installations. Electrical characteristics of solar PV arrays and the safety factors used for selecting BoS equipment, also mounting options.

Solar Panels - PV Array Calculator

Solar Panels: Solar PV System sizing and power yield calculator. Use to work out roof layouts, PV array sizes, No. of panels and power yields. Based on SAP 2009.

Flat Roof Solar PV Array Spacing / Shade Calculator

The minimum required space between parallel rows to avoid shading is decided by the height of the array immediately in front, the slope of the roof and the lattitude of the installation site. This table illustrates the different row spacings required for optimum positioning in different locations.

Solar Electricity - Frequently Asked Questions (FAQs)

How to size a system?, What is kWp?, What is the difference between a kilowatt (kW) and a kilowatt hour ( kWh)?, How does a solar PV system work? Can I add more solar panels to my system? How do I know if my solar panels are working?

Preparing for a Solar Panel Installation

As with any construction project the success and efficiency of a solar PV panel installation comes down to good planning. Some advice for potential system owners preparing for a new solar panel installation.

Planning Permission for Solar Photovoltaic (PV) Systems

A solar PV installation can be classed as 'permitted development' subject to conditions and when not located within a conservation area, AONB or world heritage site.

Solar PV, Safety & The Building Regulations

Residential PV systems notifiable under Part P. Special consideration needed for Part A. A combination of serious risks for solar PV installers.

Safely Retrofitting Solar PV Roof Mounts

The things to consider before installing a retrofited solar PV system on a roof and an introduction to the type of equipment used to secure an on-roof solar PV system.

Smart Switching / Solar PV Power Switching

Available as an addition to existing solar PV systems or installed as a package alongside a new system, Smart switching puts full control of a solar PV system's power output firmly in the hands of the system owner.

Solar Photovoltaic (PV) & Electrical Glossary of Terms

An alphabetical list of many of the industry and technical terms you are likely to come across when installing a solar PV system. The glossary also defines terms that are used in roofing and electrical work as well as in solar PV installation and solar manufacturing.

ABB / Power One Aurora Inverter Faults and Repairs

Power One, at one point were the second ranked inverter manufacturer in the world and there are many Power One Aurora Inverters installed in the UK. The most popular models being the Uno PVI-3.0-TL-OUTD and the Uno PVI-3.6-TL-OUTD.

Fronius IG / IG Plus Inverter Faults and Repairs

Fronius IG and IG Plus series inverters have LCD displays on the front of the chassis that providing it's working, will highlight any errors with the inverter or the solar PV system that it runs.

Mastervolt Inverter Faults and Repairs

Mastervolt Sunmaster and the smaller Soladin ranges of inverters were widely installed in the UK between 2011 and 2014. Popular Sunmaster models being the Sunmaster XS2000, Sunmaster XS3200 and the Sunmaster XS4300.

SMA Sunnyboy Inverter Faults and Repairs

SMA Sunnyboy Inverters have been widely installed in the UK, some of the most popular being the SB1200, SB2000 and SB3000. High frequency models include the SB2000HF, SB2500HF, and SB3000HF. Transformerless models include the SB3000TL and the SB3600TL.

SolarEdge Inverter and Optimser Faults and Repairs

The SolarEdge system is unique and in our opinion unrivalled in terms of it's ability to monitor system performance down to panel level. This is achieved through the installation of a small unit called an optimiser.

Sonnen Macht Inverter Faults and Repairs

The problem we often find with these inverters are damaged relays, the tell tale sign of a relay failure is an Error 19: Relay or Error 19: Relay Fault warning displayed on the inverter's display.

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