Thank you for your responses. Regards =20 Mark Stapley Traffic Systems Design Engineer Bedfordshire Highways =20 Amey | Service is our passion. People, our strength -----Original Message----- From: tcug-bounce@xxxxxxxxxxxxx [mailto:tcug-bounce@xxxxxxxxxxxxx] On Behalf Of Peter Jones Sent: 22 April 2008 15:44 To: tcug@xxxxxxxxxxxxx Subject: [TCUG] Re: Back up power supplies Mark, We debated this matter over the years but agreed that there is a danger of setting a precedent. If you apply such to one site, you could have a very difficult argument trying to justify why you didn't apply it to all sites. Also, it raises the importance of the safety aspect of signals when in fact, they are mainly to control traffic to improve flow but obviously have safety factors built in. Failures happen, and when they do, the courts appear more concerned with whether or not you have a reasonable system in place. We do, we have a 3 hour response time for urgent faults and contact the Utility company for mains fail. However, they do not respond to response times as such but will give priority normally. Until all sites are very low voltage and a battery back-up can be provided... topped up with solar power maybe, I can't see how any alternative system could be implemented 'reasonably'. Regards Peter Peter Jones Principal Traffic Systems Engineer Phone: +44 (0) 151 934 4254 Fax: +44 (0) 151 934 2850 Sefton MBC - UTC 3rd Floor Magdalen House 30 Trinity Road Bootle L20 3NJ >>> "Stapley, Mark" <Mark.Stapley@xxxxxxxxxx> 22/04/2008 15:07 >>> Does anybody use a form of back up power supply for their signals when there is a power fail? If so please could you pass me any info you have? =20 Regards =20 Mark Stapley=20 Traffic Systems Design Engineer| Bedfordshire Highways t: 08453 656130 | m: 07725 445685 | e: mark.stapley@xxxxxxxxxx=20 Woodlands Annex | Manton Lane | Bedford | MK41 7NU Amey | Service is our passion. People, our strength =20 ************************************************** COMPANY PARTICULARS: For particulars of companies within the Amey Group, please visit http://www.amey.co.uk/Home/Companyparticulars/tabid/182/Default.aspx. Amey plc, Registered Office: The Sherard Building, Edmund Halley Road, Oxford OX4 4DQ, Registered in England: 4736639 CONFIDENTIALITY NOTICE: This email message and accompanying data are for the sole use of the intended recipient(s) and may contain information that is confidential. If you are not the intended recipient, you are notified that any use, dissemination, distribution or copying of this message or data is prohibited. If you received this email message in error, please notify us immediately and erase all copies of this message and attachments. Please note that Amey monitors incoming and outgoing mail for compliance with its Email Policy. This includes scanning emails for computer viruses. ************************************************** ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug <>This message is intended for named addressees only and may contain confidential,=20 privileged or commercially sensitive information. If you are not a named addressee=20 and this message has come to you in error you must not copy, distribute or take any action=20 on its content. Please return the message to the sender by replying to it immediately=20 and then delete it from your computer and destroy any copies of it.=20 This message does not create or vary any contractual relationship between Sefton=20 Metropolitan Borough Council and you.=20 Internet e-mail is not a 100% secure communication medium and Sefton Metropolitan=20 Borough Council does not accept responsibility for changes made to this message=20 after it was sent.=20 Whilst all reasonable care has been taken to ensure that this message is virus-free,=20 it is the recipient's responsibility to carry out virus checks as appropriate and ensure=20 that the onward transmission, opening or use of this message and any attachments will not=20 adversely affect their systems or data. Sefton Metropolitan Borough Council does not=20 accept any responsibility in this regard." ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug