Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 9 replies
  • Subscribers 38 subscribers
  • Views 1348 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

concrete pad anchored 24vDC scissor lift and equipotential bonding

psychicwarrior

Hello good afternoon everyone. I'm after an opinion please on a requirement to bond.

A '4 ton' twin scissor lift platform installation to a concrete pad [set in the ground], for raising vehicles, has 2 seperate ground anchored metal base and framework scissors  and each contains a 24V DC motor.  These scissors are connected to a control unit which draws its supply, from the the 240V AC electrical installation.    Other than the case of the control unit (confirmed as exposed parts), the metal work of the scissors is not electrically earthed (or intended to be) I am informed due to the extra-low voltage motors.

It could be (could it) that once the bases of the scissors are anchored into the concrete pad, especially depending on the anchoring arrangement (depth etc),  that this metal work becomes extraneous part.

The detached garage is supplied from a main building with TN-C-S earthing arrangement  (the garage does not have any other extraneous parts).

Would folk agree that  there is/could be a bonding requirement for the scissor parts  and is there any issue with doing this (if it is extraneous) with the 24V DC arrangements contained ?

Thank you.

Habs

Parents
  • 0

    Thanks for commenting AJJ

    I omitted to mention that I was conscious of being an issue really only if there is a within reach situation ... that would be the control panel casing possibly depending on how close it is to the scissors, or perhaps from [faulty] piece of equipment plugged in to near by sockets and used when working under a vehicle. It all seems a bit of a rare risk I agree.

    Yes the membrane may affect and I am aware of the testing to establish how 'earthy' the metal work ends up.

    that said, let's say it may be best to bond all things considered, is the issue of the 24V DC an issue ... I presumed not as it will be separated one would have thought... for one thought ?

    On balance even before I posted, I was leaning to not being inclined to bond, due to the within reach mainly being unlikely, but worth sharing just in case any one spots something to be aware of.

    Thank you

  • 0 in reply to psychicwarrior

    If you bond the equipment won't it then become an Exposed-conductive-part that could become a danger if the P.M.E. installation loses its supply P.E.N. conductor? You don't want a large live metal structure at 240 Volts open to touch do you?

    Z.

Reply
  • 0 in reply to psychicwarrior

    If you bond the equipment won't it then become an Exposed-conductive-part that could become a danger if the P.M.E. installation loses its supply P.E.N. conductor? You don't want a large live metal structure at 240 Volts open to touch do you?

    Z.

Children
No Data

Community Rules & Guidelines