When ATEX first came about, I remember reading somewhere that it was ok to re-use pre-ATEX electrical equipment on new installation work (assuming the equipment is in good condition) & to re-furbish existing pre-ATEX equipment (e.g. motor overhauls). Could anybody name a standard or other...
We have some new workshop machines purchased from abroad, the wiring diagrams for the motor starters are identical to the following:-
http://www.ssusa.cc/reference/wiring_diagrams/standard_series_drawings/series_110/110_01.pdf
The are rated at 2.2KW / 1.1KW, but both overload relays are set...
If TV’s contain switched mode power supplies, then protective conductor current is your likely problem. If you are in the UK, any new or altered socket outlet circuits which may be used to supply IT or electronic equipment should comply with section 607 of BS 7671 (high integrity earth).
The...
For many years we have used 3- phase welding sockets incorporating Emguard earth monitoring units & 30mA RCD units.
We are thinking about ditching the Emguard units & just having sockets with built in RCD units.
Any thoughts on this, anybody else use welding sockets incorporating earth...
I'm looking for a short course to provide me with a better understanding of HV Substation design & HV distribution.
Kefax (IEE Endorsed Provider) in Mansfield do the following......Distribution System Design & Planning 5 day course.
Any advice would be much appreciated.
Cheers.
Alan
I’ve come across two similar 60/1A ct’s, one is marked two primary turns, the other three primary turns. Does this mean two / three primary turns respectively are required to give a 60/1 ratio in each case? To me, a 60/1A ct is 60/1 with one primary passing through???
Thanks in advance.
Alan
When terminating SWA cable glands into painted metal gland plates, traditionally we use brass earth tags with individual single core cables to an earth bar, this is not a problem in distribution panels put can quite easily over fill an earth bar in a distribution board.
What do others think...
ejnjkj
"V.F.D's just aren't reliable in any working conditions"
We've been using them with for many years with few problems, particularly modern types.
“They are very complicated electronic devices, and unless you are an electronic wiz they are not serviceable”
The old versions were easy to...
oceanamber,
Rather than using BN, BK & GY (we previously used R,Y & B) in circuit
reference labels, cable tags & core tags, we will be using L1,L2 & L3 for
phase identification & N for neutral (as these are un-changed).
Therefore an addition to circuit E1/R4 in the hospital mentioned would be...
Where I work, we were planning to change over later this year, but have been forced to change over has from now because our cable supplier has depleted stocks of the ‘old’ colours.
I bet the IEE never thought of this when giving the two years grace!!!
Alan
Lots of interesting replies here.
We used to install a lot of Danfoss drives, Danfoss strongly recommend the fitting of a back plate if the drive is not mounted directly, to ensure all cooling air is dragged passed the cooling fins.
Anyway, why on earth would anyone weld brackets onto a...
Would anyone be able to point me in the right direction in obtaining factual cases of fires / explosions in hazardous areas caused by static electricity, non suitable electrical equipment, non compliant electrical equipment installation practice, non compliant electrical working practice or lack...
According to the GAMBICA / REMA guide on best practice for the installation of Power Drive Systems (Guide 3). http://www.gambica.org.uk/
3.4.2.3 PROTECTIVE CONDUCTOR (EARTH) CONNECTION.
To operate as a protective conductor, the shield conductance must be at least 50% of
that of the phase...
ICEMAN,
I forgot to ask if you could point me in the right direction in gaining examples of fires / explosions caused by electrical equipment in explosive atmospheres?
Alan
ICEMAN,
Thanks for your help, it's certainly an eye opener!!
Another cause for concern is non EMC compliant VSD installations (typically no segregation of supply, motor & control cables) causing harmonics in the supply which may cause overheating of non VSD Ex motors???
With regard...
ICEMAN,
I read your threads with great interest, there aren’t many people on these forums with the depth of EX knowledge you seem to have.
I’m an E/I Inspector at a chemical plant, for several years now all our Exd motors supplied by invertors MUST be inverter rated with thermistor protection...
A.
This is easily solved, just use three copper links or crimped single core cables (large enough to carry the phase current = F.L.I / 1.732) to link out the three sets of motor terminals.
I.E connect:-
U1 to V2
V1 to W2
W1 to U2
Hope this helps?
Alan
