Originally Posted by Gaz2509
Ok today an electrician has carried out a electrical installation condition report on a care home my family own.
A few things he has mentioned needing work and I'm unsure, he has mentioned.
1. Approximately half of sockets have bare earth wires twisted together with no sleeving ( I asked him to sleeve theseand he has said he can't do this with our turning the power off, is this correct? Due to the areas needed doing its not easy to turn the power off . Can't they be sleeves with power on as he's not disconnecting the live and neutrals?
2. Metal back boxes with both fixed lugs have no earth straps to metal back box, is this required? I know it wasn't when the property was wired.
3. Metal back box entry hole has cable running into them carries by trunking but u can still see inside hole, no grommets , does this need grommets?
I look forward to your urgent help a he's suppose to be coming back in the morning but I don't want to turn power off if sleeving can be done with power as there is high risk areas due to the nature of the residents .
Thanks again in advance
Current should not be flowing on the ground. But there is no guarantee that it is not.
If current is flowing on the ground and you untwist the cluster of ground wires to put the sleeve on, then there will be a spark.
No problem sleeving the ground wires if you can do it without taking them apart.\\
Twisting the ground wires together is nowadays not good enough, you need a crimp sleeve or a wire nut.
For metal boxes (outlet boxes, junction boxes, panels, etc.) the box itself has to be connected to the ground wires (equipment grounding conductors) using a screw that is not the screw holding on a clamp that in turn holds wires or cables entering the box. For a subpanel, the ground bus (terminal strip), if properly attached, is sufficient. For the panel with the main disconnect switch or breaker the neutral bus needs to be bonded to the panel for example using a jumper strip or with a bonding screw that digs into the panel back.
Where wires enter the panel, a bushing or grommet is needed so the sharp edges of the panel hole or the end of a conduit do not cut the wires.