Small industrial unit, advice on pricing

[mgnelec09]

Thanks for getting back to me with this bugsy. much appreciated

 

[i=p/u]

my kind of price??

 

[bugsy]

Forgot to metion includes MK commando interlocked 415 s/o , MK metal clad DSSO ,priced as basket not tray ( easier to install) 415 runs all radials

 

[Engineer54]

Its a joinery shop only manned by 1-2 people.

therefore probably only 2 machines used at any one time.

thanks for your help

OK, Presently just two persons working in this factory unit, but that may increase as and if demands for the product(s) increase.

As suggested, wire any 3 phase outlets individually back to the DB, and balance across the phases, again ascertain the outlets that are going to be used most frequently. Not too sure about using catenary wire to hang the tray-work from. It's not going to be particularly rigid when clouted by lengths of wood, as it probably will be from time to time. Any reason for not using studding, it will give a little more rigidity ??

As for the the general purpose 13A socket outlets, i personally would use metallic conduit in an industrial environment, much better for mechanical protection, but aesthetically too. Conduit installations can work out much cheaper to install than SWA cabling if you are competent on conduit fabrication. To be honest you can't get much easier, than a single conduit run around the exterior walls, ...remember you don't have to make the conduit a ring back to the DB, only the circuit wiring . A single ''staggered ring circuit'' pulled in to the conduit installation will suffice, for your general purpose outlets.

 

[somersetsparks]

Id second engineer, on one of my moonlighters I priced a similar sounding job, although a bit smaller, worked out a lot cheaper to do in 2x2 trunking and 20mm tube, looked smarter as well, just had one run of trunking from DB around 3 sides.

 

[bugsy]

Id agree with the trunking and conduit, easier to add additional circuits as well

 

[malcolmsanford]

Hi All,

I am due to wire a small industrial unit, they want 14 double sockets 10x 3phase 16 amp sockets, a new mains board and all wired in swa cable on metal tray.
The gear will cost around £1000.00. was thinking around a week to install.
can anyone give me a ball park figure for the whole job?
Ive to test and certify all work also. many thanks

NO, PLEASE, DO NOT RUN A 3ph RING.
YOU WILL NOT comply with legislation.
Listen to Engineer54.
You need to run individual supplies to each machine to comply with both 7671 & other statutory regs.
There are also considerations in 7671 you may not think about, check the brb carefully to ensure compliance in wood working premises.
It is easy to install a non compliant installation without realising!

Would you mind quoting the regulations in BS 7671 that says you can't run 3 phase sockets in a Ring.

 

[remer1957]

Are all the machines near the walls of the unit or is there a need to install further containment like unistrut etc? I would definetly put each machine on it's own circuit, I would also make them all type C or D breakers. Use a good quality DB-Merlin is hard to beat as they are easier to install. It's always good to allow 25% spare capacity on the DB anyway. Also from experience one week seems a little light on the install time, there's going to be a lot of testing and O and M's paperwork too. Will you need to hire access equipment? If I were pricing it I would probably be just under the £3,000.00 mark.

 

[remer1957]

Amost forgot-is someone else doing the fire alarms? If not this can be good earner as you are installing in the building anyway. A place like this may only need a couple of call points, or one detector as well, if they have an internal office. 2 sounders should get you your 65dB, but they may need beacons as well if there is to be high noise levels ofr over 30 seconds

 

[davelerave]

i would go with radials for machines as well

all type-c breakers

if there's 30ma required on 13amp sockets i'd use radials and rcbo's- i assume there isn't here?


i remember mention here of issues with steel systems and dust from joinery workshops? i'm not too familiar

 

[remer1957]

I think it's a must to use RCBO circuits-these small workshops are infamous for using all kinds of dodgy portable equipment, which incidently, brings me to another question-who is going to do the PAT? While you're there, etc. etc.

 

[somersetsparks]

Would you mind quoting the regulations in BS 7671 that says you can't run 3 phase sockets in a Ring.

Would you mind quoting the regulations in BS 7671 that says you can't run 3 phase sockets in a Ring.
As far as i'm aware there is no regulation, in fact rings are permissable for just about any size of circuit and certainly quite common in installations such as these!

 

[malcolmsanford]

Hi All,

I am due to wire a small industrial unit, they want 14 double sockets 10x 3phase 16 amp sockets, a new mains board and all wired in swa cable on metal tray.
The gear will cost around £1000.00. was thinking around a week to install.
can anyone give me a ball park figure for the whole job?
Ive to test and certify all work also. many thanks

NO, PLEASE, DO NOT RUN A 3ph RING.
YOU WILL NOT comply with legislation.
Listen to Engineer54.
You need to run individual supplies to each machine to comply with both 7671 & other statutory regs.
There are also considerations in 7671 you may not think about, check the brb carefully to ensure compliance in wood working premises.
It is easy to install a non compliant installation without realising!

Would you mind quoting the regulations in BS 7671 that says you can't run 3 phase sockets in a Ring.
As far as i'm aware there is no regulation, in fact rings are permissable for just about any size of circuit and certainly quite common in installations such as these!

Sorry Sommerset but as you highlighted my question, which is the same as yours. I want the poster to advise me of the regulation that say you CAN"T run 3 phase sockets in a ring ....................becasue I know there isn't one.

 

[davelerave]

might want emergency stops as well

 

[somersetsparks]

Also don't know if I would go with the small radials and RCBO's it means a lot of ways taken up in the board. I would just run 2x 4mm 32a radials or 2x 2.5 rings.
For DBs I always find Wylex to be a happy medium for price and they are OK to install, Merlin Gerin (Now schneider) are probably nicest.

Like I say depending on how awkward it is, I would run trunking around and do tube down to points, it looks better than tray and swa in small workshops and is nearly indestructable. Will also save a fair amount on cable costs and it can be quite time consuming to get nice grouping of cables on tray if theres lots of little'uns.