I'm ordering new 400V MCC's at the moment and was planning to go with Air insulated and supplier is pushing Insulated busbars.
Basicialy just a plastic cover on the busbar.
I'm of the view if sufficient spacing in used in the construction then the insulation does not offer much extra...
I am planing to install a buried copper lattice tape earth mat. 900mm x 900xx mesh of copper tapes 3mm x 25mm.
I have performed calculations for substation earthing grids but cannot find the formulae for calculating the resistance.
Help would be greatly appreciated
I am working in an industrial plant, installing a new gas boiler.
At a number of locations we will install small vertical pipe supports, there pipe supports will be isolated and only connected to the Pipes.
the pipes ( Steam, air, Water ,Gas) will all be earthed as will the main Piperack...
With a 3-phase star Delta motor , with three contactors.
Does anybody know what will happen if one of the contactors welds shut.
Essentially there will be a voltage supplied to one side of the windings.
I am having a discussion whether the contactors on both sides of the winding is sufficent...
I have a motor 4kW, DOL Start, with a Telemechanique GV2ME14 Motor Circuit Breaker.
The motor an ATEX rated Motor and is installed in ATEX Zone 2 area.
The motor manual is not clear on whether the Thermistor has to be wired if the motor is not fed from an inverter. I have emailed the...
I work for a company that makes a small number of machines, and does work CE Marking third party machines.
EN60204-1 says that you may need to perform Insulation Resistance tests but gives no guidance on when you may need to perform them. I'm trying to develop a few guidelines on when we should...
I'm looking to find a supplier for a CAm box based in Europe. The box is to be retrofittd onto an existing old press. I have had a good look ath the Balluff range and they are offering something I can work with but I cannot find a second manufacturer offering, a mechanical rotary limit switch...
I'm wondering about the difference in the construction of armoured cable. When it is screened and unscreened.
Am I right in saying that for the same size cable the insulation between the Core and the armour is the same as that found on an unarmoured cable.
But the insulation between the screen...
I need to test the insulation resistance of a 3-Core cable, but one end is still attatched a 3.3kV/400V 1.5MVA oil filled trandsformer.
I'm planning to connecct 5kV to all three cables and the earth to the Cable Armour, which is connected in turn to the Transfomer frame.
That will check the...
I'm installing a new 3.3kV Board downs sream of an existing Board fed from a 10MVA 11/3.3kV Delta Wye Transformer, with a 1500A NER on the WYE.
I'm working on the protection settings for the new Board and the breaker feeding it, and trying to discriminate with the feeeder to the existing Board...
I've installed a prefabricated switchroo. It comes on a module onLegs.
The temperature in the module is kept at 20degC
However as the MV cables wnter the switchgear through a gland plate in the floor. A questin has been raised regarding the posibility of condensation in the switchgear.
There...
I have 3 UPSs, all 400V. Two are 40KVA and one is 30 KVA.
The Load that they are feeding is 50KVA.
I want to set the UPSs up in a Duty/Standby so if one of the UPs fails I'll still have the other two powering the Load.
I also want to use the common battery Bank for all three of them.
I also...
I have an applications where I'm installing 3 single core XLPE/AWA Cables.
The cables will be installed into an existing Steel Gland Plate and I need to calculate the possible circulating currents in the plate. (I know it should be a non-ferrous but it;s not really an option.
Does anyone know...
I have an application in the UK where a 3.3kV AWA cable is being installed. The Length is 250m total and most is being installed in a Cable tunnel or outside on tray, but the Last 14m passes through a duct.
The Max current is 560A.( this would assume that 2 normally open points have been closed...
