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Mixed Wiring

Former Community Member
Former Community Member
We have been invited to tender for the rewire of lighting and power to a government building.
The single compartment trunkings carry recently installed ELV cabling consisting of fire alarm and general alarm cabling. We have been asked to replace the existing LV singles.
Existing services to the ceilings means there is no capacity left to install new containment and would almost be impossible to install.
To install the LV wiring would depart from BS7671 528.1 / 515.2 / 528.3 along with BS5839 and BS8519
7671 states ‘Any intended departure from these Parts requires special consideration by the designer of the installation and shall be recorded on the appropriate electrical certification specified in Part 6. The resulting degree of safety of the installation shall be not less than that obtained by compliance with the Regulations.’
Since there is no design or intervention by any electrical consultants I would assume we become the designers simply by installing the cables into the trunkings and terminating into the various items of equipment.
As a result I wouldn’t say that the resulting degree of safety of the installation shall be not less than that obtained by compliance with the Regulations is met, as stated above.
Is just merely noting the departure on the EIC sufficient or should I be looking for some form of written agreement that the installation will not comply with current standards.

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    stevechrry:
    . . . Is just merely noting the departure on the EIC sufficient or should I be looking for some form of written agreement that the installation will not comply with current standards.

     




    You have a number of problems here. If you don’t install to the standards and something goes awry later, you (or hopefully your insurers) may be liable for the cost of repairs etc. The other problem that I can see, is that if you are not complying with the technical and commercial conditions in the Invitation to Tender document, the client may be entitled to withhold some or all of the money until the defects are rectified. It all depends on how skilled the client’s technical and commercial authors are. 


    Regards,


    Alan. 

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  • 0

    stevechrry:
    . . . Is just merely noting the departure on the EIC sufficient or should I be looking for some form of written agreement that the installation will not comply with current standards.

     




    You have a number of problems here. If you don’t install to the standards and something goes awry later, you (or hopefully your insurers) may be liable for the cost of repairs etc. The other problem that I can see, is that if you are not complying with the technical and commercial conditions in the Invitation to Tender document, the client may be entitled to withhold some or all of the money until the defects are rectified. It all depends on how skilled the client’s technical and commercial authors are. 


    Regards,


    Alan. 

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