Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest
The WTF Electrical Photo Thread - NO CHAT - JUST PICS - Read post #1 before posting
-
11-04-2015 8:42am#1I robbed this idea from the plumbing thread but think we should post pictures here of any crazy electrical issues we find or things that are just bonkers!
<Mod edit>
A few rules about posting here:
1. No identifying information whatsoever.
(This also means company names are not to appear in photos).
2. Size photos properly.
3. Let's try to focus on photos and keep chat to a minimum. No quoting pics/posts please. If you would like to discuss something feel free to start a thread.
4. Remember the Forum Charter still applies.
5. If you arent sure about an image then PM the mods to ask before posting.
Enjoy
</Mod edit>
0
Comments
-
-
-
-
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭
Join Date:Posts: 12300
This demonstrates the importance of carrying out an insulation resistance test (Meggar test). This cable was joined in a "submarine joint". Unfortunately the joint was not very good because the neutral was shorting to one of the phases.
0 -
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭ Join Date:Posts: 12300
There was an issue with a popular 63A switch fuse arrangement that was on sale throughout Ireland.
The 10 sq. link cable failed at the point where the lug was attached, causing it to overheat.
0 -
Advertisement
-
-
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭ Join Date:Posts: 12300
This problem is kind of hard to see.
The issue was that the earth cable was massively undersized. I think that it was a 75 sq. and each phase had two 185 sq. cables.
0 -
-
This and more on this site
http://professional-electrician.com/caughtoncamera/caught-on-camera-march-2015/0 -
-
Advertisement
-
-
-
-
-
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭ Join Date:Posts: 12300
This picture shows open heart surgery on a ACB (air cuit breaker) to replace a failed shunt relay.
I was a little nervous as the powerful spring in the breaker was charged and it was not possible to discharge prior to working on it :eek:
The next picture shows an injection test of the breaker.
This was carried out at a very low voltage (around 0.01 volts) and a very high current (>2000 amps) to ensure that it operates as per design intent.
0 -
These relics will give you sunburn. Circa 1950.
Operators had to follow their target on stage while feeding a carbon arc electrode to maintain the arc watching through a welding mask lense.
Carbon Electrode & Reflector
Transformer ~ 4.5kVA I think
Control panel.
Gubbins + another control dofer.
None of this fancy shunt business. Full load wired through the ammeter.
0 -
-
-
-
-
Advertisement
-
-
-
I think we've got our metal doors crossed. Clicky.Anyone seen one of these scissor lift chargers before?
0 -
-
-
-
-
Was helping someone tidy up apartment between tenants.
Storage heaters timeclock and relay. Immersion was a remnant of gold shield, wired back to storage heater circuit. This meant that no boost function during day............but there was and further, during day, the storage heaters could be energised when their spur was switched on!!
The tails I have removed in image below are 1.5's which were parelleled with power in, and I traced them back to rear of a 13A socket in livingroom!!
So, during day, the storage heater and immersion circuit was supplying the load side of relay and associated circuits via a 1.5 t+e!!
0 -
-
Advertisement
-
-
-
-
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭ Join Date:Posts: 12300
Not the most beautiful panel, but there are other issues: Single core conductors carrying AC current should not pass through a ferrous metal plate.... :eek:0 -
-
-
Advertisement
-
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭ Join Date:Posts: 12300
I was at a FAT today at a well known facility and saw the above, so I had to ask a few questions.
So what is it?
One large custom built variable speed drive for a single motor (to be installed on a site in Ireland). The motor in question is 2.8 MW. The 3 phase output from the VSD is 690V. It takes two supples from a dedicated 6kV / 690V transformer, hence the 2 air circuit breakers. This transformer provides 2 its our output windings, one is star wound and one delta wound. This provides a 30 degree phase shift between the 2 outputs which is good for harmonic reduction (THD is just 12%). Once both supplies have been rectified they are connected to a common DC bus, then to a 5 paralleled R8i units which provide the variable frequency 3 phase 690V output to the motor. Interestingly the transformer output has no earth reference, therefore the motor does not either.0 -
-
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭ Join Date:Posts: 12300
Generally speaking we don't get to see busbar like this, I just happened to be present during the panel build so I took a quick photo. This particular example is rated for 4000 A. Parts of it were c & c machined. Excellent work IMHO.
0 -
-
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭ Join Date:Posts: 12300
I have just returned from Cuba. The standard of their electrical installations is pretty poor, but it is interesting as it illustrates just how much it is possible to get away with for those willing to take the risk.
The electrics shown in the next 3 photos are all installed outdoors and somehow continue to function:
I really like the way that they give you a choice of 110 or 220V socket outlets. What I find odd is that the sockets are identical, so there is nothing stopping a person from plugging a 110V device into a 220V socket. These ones are "posh" because they some with stickers, most don't. If you are lucky the voltage may be written in pencil above the outlet.
1 -
Advertisement
-
-
-
-
-
-
-
-
Press above the front door. To turn off a fuse you open the press door & remove the fuse box. You then put fuse box back in the press when job is done.
It can't be legal? You are moving all of the cables each time you need to turn off a trip switch. Can't be safe
4 -
-
-
Advertisement
![[Deleted User]](/applications/dashboard/design/images/defaulticon.png)
Advertisement