Search results for query: *

Please I want to know how to change the curves on the TCC graph to just single lines. At the moment they are in block (bands) and it's not giving me the outlook that I like. Please assist. Thanks...

I'm working on an Impressed Current Cathodic Protection project offshore and the above subject came up. A corrosion expert wants us to bond pipeline systems to topside at the dead weight supports. I've never heard of this term before (i'm electrical biased) and would appreciate if you can...

LionelHutz Thanks for your answer.Are you saying that for a 200w PV panel for example, the energy generated is E= Insolation value (kWh/m2/day) * surface area of the panel only? the number of hours of sunshine is not taken into account? Please advise. Thanks.

Hi there, I've been trying to solve a puzzle and this relates to solar energy generated by a PV panel (kWh/day). There are so many formula and equations out there for PV energy generated however i'm not sure which is which and which is correct! I've tried to use basic electrical knowledge to...

We just installed a new UPS suit fed from a Siemens 3VL MCCB and the switchboard is 300m distance from the load (UPS). The MCCB is fitted with an Electronic Trip Unit (Siemens ETU22) set at 1x In. My question is; as we are now commissioning the system, should an Earth Fault Loop Impedance...

Hi, This question is related to a site in the UK. I designed electrical power supplies for the site security swiping system. Some of the supplies were for control panels and auxiliaries 300m away from the power source. I always include local isolation in my design for electircal consumers...

I have 16A RCBO supplying a socket 170m away from source via 3c x 16mm cable - the armouring will be used for earthing and no CPC will be run with the supply cable. The supply voltage is 110V (CTE); can someone show me formula to calculate if the 16A RCBO will trip within allowable...

Bill, Thanks for the response. I'm in the UK so BS standard should apply.

For a 110VAC CTE system, there's an earth connection between the 2 leads of the output transformer. this splits the 100V out to +55V and -55V. It means the voltage between live and earth is always limited to 55V. I have a 2P+E socket and i'm wondering if I should connect the earth or not giving...

I work in the UK offshore sector however I now support the Dutch sector too! I'm wondering if someone can explain 230V/400V rated motor c/w star connection only. My knowledge on motor starting for big motors is you start them in star connection to reduce voltage drop on the system during...

I'm curious to know about residual charge in a subsea HV cable that's about 30km long, how it's generated and how long it takes to dissipate when the upstream supply is switched off or isolated. During maintenance of equipment downstream the cable, for example a JB, there has to be a means of...

I'm working on the above subject and i am wondering how I can apply the two methods during cable sizing activities. The load, 200A rated, is 350m away from the source with 2 cores per phase (VD issues). Majority of the cable runs are in an electrical cable trend; 20m approximately, runs in a...

Jraef: Sorry I think I mixed it up. We are mostly offered 400V/50Hz by our European Vendors and 440V 60Hz by American ones. I know this because we recently received a 440V 60Hz motor data sheet for review to be used within a compressor package. Will the same principle apply as you described above?

I've been wondering why there's so much emphasis on using only a 415V rated motors in our plant - our power generation is 415V @ 50HZ. Many Suppliers always offer 440V as standard so we're having to knock them back. Just thought someone could enlighten me on the principle behind doing this. Thanks