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Electrical Engineering HSE Perspective. ADIPS Inspection Body Conference 2010. John Madden CEng FIET Principal Electrical Inspector Team Manager Scotland, Wales & West. Agenda. BS 7671 and BS 7909 Arctic cables Generators Anything else for discussion. BS 7671 and BS 7909.

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Electrical engineering hse perspective

Electrical EngineeringHSE Perspective

ADIPS Inspection Body Conference 2010

John Madden CEng FIET

Principal Electrical Inspector

Team Manager Scotland, Wales & West


  • BS 7671 and BS 7909

  • Arctic cables

  • Generators

  • Anything else for discussion

Bs 7671 and bs 7909
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 79091
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 79092
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
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
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
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 and

manufacturers certify their

products for this voltage range.

Similarly, cables to BS 6500 are

rated at 300 V so are suitable

for 230 V applications.

Do we have a history of

problems with this type of cable?


  • 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.


  • 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 end
The End

…..Any questions/comments?