Hi All,
I wonder if anyone could advise on the requirement for an Emergency Power Off (EPO) switch in my application?
I have a small IT system, consisting of a few PCs, network switches and the like installed in a 19" rack. There is a rack-mount uninterruptible power supply (UPS) rated at 3KVA...
Hiya,
This is really outside my area, so I'm hoping you guys can come up trumps for me.
I have a project where I need to connect a number of radios together via cables (for training purposes they are not allowed to actually transmit over air to each other).
Now, I'd be quite happy connecting...
Hi,
Having waded through a number of standards, I was wondering if anyone had a definitive list (or link to such) of the statutory (ie legal) requirements that apply when installing cabling (and equipment) in the UK?
Obviously BS7671, the 16th Edition Wiring Regulations apply and are...
We are currently designing a power supply enclosure for external use. It will be powered from a 64A 230V 50Hz AC, which is both MCB and RCD protected. It will contain 4 x 3kW 28V DC power supplies. The enclosure will be IP65, and will be permenently fixed outside.
The 16th Edition IEE reg...
Hi all,
I have an application where I need a 35mm DIN rail module (a standard RCD) to be operated through a panel. This is not normally a problem, as I just have the 'switchy' bit protruding through the panel.
On this occasion, the panel needs to be IP65 sealed. Does anyone know where I might...
Hi All,
I am working on a power distribution unit that has to be used internationally, and am not an expert on the various mains supply systems used throughout the world.
Does anyone have any info on the sorts of supply it's likely to face and what the differences are?
Any suggestions...
Can anyone explain how I can correlate the surge/spike specifications I've been given to a TVSS spec?
I have a spike spec like:spikes shall not exceed +90V and/or -60V from a steady-state voltage of 26.4V.
But TVSS spec's say things like 8x20uS:160 Joules.
How do I convert my spike spec into...
Hi All,
Does anyone have any details regarding the components used in switching supplies in UPS systems? I have a power-switching application similar to a UPS, but without the need for batteries/charging.
When a 230V ac supply is available, an SMPS provides 28V dc@100A to the system. If the...
