hi
guys need to know the differnece between a module type contactor and normal contactor.
can we use moudle type contactor for power a distribution box with phase fauiler relay to avoid single phasing.
the DB box is not the main db box its made to power three machines a vacuum / compressor...
Muhammad Abid
Thread
amp
between
contactor
difference
module
normal
rating
type
Hi, do cheap chinese solar panels really perform less well than better constructed panels? (and how would you identify these better constructed panels?)
I am curious about whether they lose efficiency quicker over the years. Are there any numbers out there to quantify this loss of power over...
mascip
Thread
between
cheap
difference
panel
panels
quality
solar
solar panels
Got a 2 gang weatherproof socket to fit soon. Wondering what makes people would suggest? The house is quarter of mile from the sea so gets wind rain and everything else thrown at it!
Was looking at the MK masterseal- anybody use them much? worth the pennies?!
thanks.
Hi,
Just about to renew my insurance, for PL and PI and Tools.
I am currently with Ageas via the NICEIC, and with the above, i also get £100k of Efficacy Cover.
The current policy is £690 per year, and the new company, via simply business, works out at £390 a year, so quite a big difference...
I am away from the regs book (but who needs it anyhow Lucien!:D) but I think the minimum size for the Main earth conductor for a TT is 2.5mm or perhaps 4mm as opposed to the minimum for a TNC-S being 16mm for new builds.
It is very likely that a TNC-S will have a greater PFC ( compared to a TT)...
Hi, I understand according to 411.3.1.2, that main metalic services incomming must be bonded to MET. but what if the water pipe is shared from another property?
The premises has its own electrical supply, but the incoming water is not individual but shared.
I believe i should still Bond. Could...
Chrishands
Thread
bonding
difference
main
potential
property
supply
water
I seem not to have access to the professional forums so I post this here:
I understand ohm's law and to get a current you use Volts/Resistance (V/R); so if it's Perspective Fault Current (PFC), it's V/R or Volts/Ze; and we divided by 1000 to convert to kA. Yes?
Is there a difference when...
puffy
Thread
calculation
current
difference
fault
fault current
higher
pfc
volts
Hi all. I carried out an EICR yesterday. It was a BG split load consumer unit and when testing I noticed the zs values were coming out high.
I noticed on the 1 rcd there was 0.50 Ohms difference between feed and load side of rcd and on rcd 2 there was 0.60 Ohms difference. Just wondered if...
Whatbos the difference between an LED 'driver' and a 'PSU'? I have been steered towards some divers to power some 3w 3v 900mA Cree LEDs (link below) but they still require the equivalent power input from a PSU. So what does the driver actually do...
Upgrading my power tools and not sure wether to go for Bosch or Hilti... I use Bosch at the moment but it's my dads old gear so is getting on a bit and the batteries are a nightmare! But it's done me well. Although i had a go of a Hilti sds at the weekend and it was brilliant... Do i pay more...
Hello folks, I have just had a PIR fitted by a qualified electrician but am having problems with it. I'm sure that I don't need to go back to him with the problem, I couldn't anyway as he has gone off on hols now.
The problem that I have is, the lights keep being activated even in the very...
So how do you guys determine the size of existing tails and sub main conductors when carrying out EICR or surveys.
The reason I ask is, today I have been looking through some EICR and the conductor size stated of some of tails and sub mains is different to what I thought just by having a quick...
I'm building a new head for a milling machine using a three phase motor and VFD.
VFD's seem to be much cheaper for 230v rather than 400v, is there any disadvantage to running a motor at 230v TP than 400v TP?
I have a 400v three phase supply.
Thanks,
Hi I'm new to this forum so hello all,i would like to know the answer to this question.i come across this quite often where a radial circuit feeding 1 double socket had been connected to the same mcb as the ring main,now as we know a radial circuit feeding a socket should be protected by a 20amp...
Hi,
I passed my 236 P1&2 many years ago and I only ever worked on buildings, so no twin & earth for me.
Can anyone tell me if I would need to take any extra exams to do household work?
Many Thanks
Jason
Jsquires
Thread
between
building
difference
electric
electrical
electrician
Evening all!
I have a board change to do in Cardiff soon, no big issue with the job.
I suddenly thought about notifying it and remember seeing something on here about it being different in Scotland and wales?? Am i correct? I cant find it in here and the welsh government sites talk in...
Hi
we have a 50 h p motor driving a agittaor thru gear box 50 hp 1500:155 rpm ration rpm.
Frequency drive is dranfoss we are monitoring the power drwan by the motor is very less at 100% load.
The readings are as below at 100%
v 390 v
kw 19
amps 34
rpm 1470
motor name plate details...
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