health and safety executive health and safety executive electrical engineering hse perspective john...
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![Page 1: Health and Safety Executive Health and Safety Executive Electrical Engineering HSE Perspective John Madden CEng FIET Principal Electrical Inspector Team](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649e155503460f94affe72/html5/thumbnails/1.jpg)
Health and Safety Executive
Health and Safety Executive
Electrical EngineeringElectrical Engineering
HSE PerspectiveHSE Perspective
John Madden CEng FIETPrincipal Electrical InspectorTeam Manager Scotland, Wales & West
ADIPS Inspection Body Conference 2010
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Agenda
• BS 7671 and BS 7909
• Arctic cables
• Generators
• Anything else for discussion
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BS 7671 and BS 7909
• BS 7671 – Requirements for electrical installations– Covers requirements for LV power
generation & distribution systems– Non-statutory, apart from in Building
Regulations– Provides route to compliance with Electricity
at Work Regs– Section 740 contains specific requirements
for amusement devices etc
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BS 7671 and BS 7909
• BS 7909 Code of practice for temporary electrical systems for entertainment and related purposes– Non-statutory standard– Offers guidance on management and
control of event electrical systems, as well as design issues
– Cross references BS 7671.– Makes recommendations for inspection
and testing.
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BS 7671 and BS 7909
• The two standards appear to be complementary.– BS 7671 provides detailed technical requirements
that are treated as a benchmark technical standard– BS 7909 provides a commentary on the application
of those requirements and how to manage electrical safety at events
• There is no duty to comply with either of these standards, but they do provide a useful and helpful route to legal compliance.
• Are there problems from the ADIPS perspective?
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BS 7671 Section 740
• The most controversial requirements appear to be:– 300 mA RCD at origin.– 30 mA RCD protecting lighting and socket-
outlet circuits and mobile equipment connected by 32 A flex.
– Inspection and testing after each assembly on site - open to interpretation, judgement required.
• Are these problematic?
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Arctic cables
• Flexible cables for use at low temperatures. Main applicable standards are:– BS 7919 Electric cables. Flexible cables rated
up to 450/750 V, for use with appliances and equipment intended for industrial and similar environments
– BS 6500 Electric cables. Flexible cords rated up to 300/500 V, for use with appliances and equipment intended for domestic, office and similar environments
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BS 7919 Table 44
The IET has advised that this cable is suitable only for 110 V applications. It is unclear why this should be the case – the standard clearly indicates suitability for 300/500 V duty andmanufacturers certify theirproducts for this voltage range.
Similarly, cables to BS 6500 arerated at 300 V so are suitablefor 230 V applications.
Do we have a history of problems with this type of cable?
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Generators
• A continuing cause for concern– Inappropriate o/current
protection– Badly made connections– Access to live parts
• They are a crucial part of the electrical system and should both be safe and subjected to routine inspection by a competent person.
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Generators
• It is my view that generators and supply cables should be part of the ADIPS inspection regime.
• Where possible, amusement devices should be inspected and tested with a generator connected, preferably the one that’s being used operationally.
• Controllers should know how to connect them safely and how to use distribution switchgear to distribute power to multiple loads.
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The EndThe End
……....Any questions/comments?Any questions/comments?