Emergency stops for LAB sockets

[infinity]

There are various rooms, some rooms have one circuit, some rooms have 2 rings, all fed from various different DB's. Switching Db's is obviously not an option as offices etc are also supplied.

If i can find the rings coming into the rooms it will be a lot easier. It does look like a tidy install not too old, all labelled up so i would expect to see a tidy install above the ceiling as well, which will also help.

 

[HandySparks]

.... and use stop button to coil on N/C contractor ...

Do you really mean this "N/C"?

If so, I suggest that the job goes elsewhere.

 

[tazz]

With offices a various dbs now in equation ....this sounds like new circuits are required
Infinity ment N/C circuit Handy sparks

 

[infinity]

N/C circuit with switch opening the circuit what's wrong with this handyspark?

The circuits in the rooms do not supply figures just the DB's do hence no switching of DB.

 

[i=p/u]

Or as biff says change to radials....

 

[ahtyrrell]

You may also want certain sockets in the room to stay on even if the E stop is pressed E.g. computers around the room or a computer and projector on the front desk

 

[HandySparks]

N/C circuit with switch opening the circuit what's wrong with this handyspark?

Nothing.

But what you said was N/C contactor, ie closed when the coil is de-energised, which for an em-stop circuit is not what's required.

 

[netblindpaul]

Work to the relevant & recognised Code Of Practice as published by the BSI, that is BS4163 and all will become clear, the requirements are spelt out in that standard, easy.

 

[not clever]

28 posts and only 2 give a descent reply
Mdj with the e stop and separate single key reset switch and blind Paul with the code of practice to go by.

 

[tazz]

28 posts and only 2 give a descent reply
Mdj with the e stop and separate single key reset switch and blind Paul with the code of practice to go by.

And your answer to multiply rooms with radials & rings mixed with offices, with numerous dbs located in different areas .....IS...?

Always one to make big comment.....without a solution.....!!!!

 

[Hawkmoon]

If I were faced with this (as described) I would:

1) Install submain DB to each lab incorporating contactor etc on din rail.
2) Get above ceilings and rewire/reroute all cabling as necessary to separate the labs/offices accordingly.
3) End result - each lab with own ring fed from new sub DB
4) E-Stop with keyswitch wherever.

A lot of work/cost etc but I don't see an alternative - just get stuck in!

 

[tazz]

good constructive input

 

[Engineer54]

If I were faced with this (as described) I would:

1) Install submain DB to each lab incorporating contactor etc on din rail.
2) Get above ceilings and rewire/reroute all cabling as necessary to separate the labs/offices accordingly.
3) End result - each lab with own ring fed from new sub DB
4) E-Stop with keyswitch wherever.

A lot of work/cost etc but I don't see an alternative - just get stuck in!

Very similar to the requirements within our Medical Labs Building, except ours are a bit more involved, many being monitored by safety isolation supply units (similar to that found in many school lab classrooms), and a hazardous gas detection alarm system....

 

[Hawkmoon]

Very similar to the requirements within our Medical Labs Building, except ours are a bit more involved, many being monitored by safety isolation supply units (similar to that found in many school lab classrooms), and a hazardous gas detection alarm system....

Not worked on that kind of setup - sounds interesting.

Strangest emergency stop install I've come across was in a number of MOD establishments where the stop button, when pushed, shorted neutral & earth on an RCD protected server installation (N+E picked up at nearest socket then wired to n/o on stop). I wasn't testing the install so thankfully did not have to code it lol.

 

[i=p/u]

What he means monitored is by rcd .

 

[Engineer54]

What he means monitored is by rcd .

If you're talking about my post, you would be making the wrong assumption here!!