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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
Agenda
• BS 7671 and BS 7909
• Arctic cables
• Generators
• Anything else for discussion
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
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.
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?
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?
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
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?
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.
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.
The EndThe End
……....Any questions/comments?Any questions/comments?