Electrical Advice

Unable to get Zdb on 110VDC Unit

I’ve got a central battery system at work which has slave emergency circuits.

There is a 230VAC supplyto a transformer which then has a rectifier supplying DC to the circuits. The bulkheads are custom made with inverter inside.

I can get a Zdb at the 230V supply, thus able to calculate the Zdb at the 110V load of transformer… however when using a Megger Loop Tester (LTW425) I receive the error code “Chck” which when I looked it up says it’s lost connection and retries after a couple...
 
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MFT for Solar PV Commissioning

Hello

I am a self employed electrician, My background is heavy industrial electrical maintenance mostly on power stations and wind turbines. However I am now transitioning into installation and have been cracking off my qualifications for installation to become eligible for a competent person scheme which I have almost achieved (2391 ongoing).

I have experience with dedicated testers such as Megger IR testers, Fluke multimeter, current clamps, Sverker injection testers and ductors however...
 
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Spanish grid collapse

Interesting article below.

apple.news

Opinion: I’m a power engineer. The Iberian grid collapse makes me very afraid for Britain — The Telegraph ​

We will soon lose most of our remaining grid inertia, increasing the risk of outages
apple.news
apple.news

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LED tape with effects

Does anyone have a source for good quality LED tape that has programmed effects rather than just one colour at a time.
“Addressable” or “pixel chasing” would be the description.

Local gym wants 4 parallel lines along their ceiling in the exercise room above the bikes to give the illusion of forward travel.

Need 4 lines of about 8 or 9 metres long, but the main thing is, they need to synchronised. Ie, speed, colour, rate of change need to be constant across the 4 lines.

I had a short 3m...
 
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TNCS Research and question.

Hi, I have been reading about earth bonding in home electrical systems and on reading my installation report it says my supply in my new build home is TNCS. I was wondering if an CPC/Earth wire should be running to my gas or water pipework in this setup?

It appears to go to a metal block connector from the incomming supply and through the wall presummably to the indoor consumer unit, there isn't however any earth bonding in the gas meter box or on any pipework under the sink with the stop...
 
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Isn't grounding where people can touch dangerous?

Hey engineers!

I'm not an engineer, I know nothing, so I thought I'd ask you about this.

From what I've heard, if you don't have proper ground (a rod) in your house, you should never try to make a "cheap DIY fix" by conencting ground to some radiator or whatever. From what I've heard, the reason for this is that when some appliance in my 230v AC house breaks so that live touches the metal case, and ground trips, then any possible person in the building who happens to hold his or her hand...
 
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Pv EICR code

Hi

We have just won a job to provide eicrs to a group of new build properties owned by a local housing association. (5 years old)

Each property is fitted with solis mini 1500 4g invertor in the loft for the pv installation.

Every single property appears to have a split load board. Hager Type A rcds and a 16amp mcb supplying the invertor.

Does anyone have an opinion on which code should be used here?

It's not a high integrity board, meaning no spare way to move the pv circuit...
 
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Spanish wiring regs: the basics

I'm assessing the extent of the work needed for a renovation project which has been recently, but I suspect poorly, re-wired. I'm not an electrician: I am, or was, a chartered engineer, so I should be able to work my way through this and evaluate the state, but I would love a bit of help to make sure I'm getting it right.
I'm looking at ITC BT 25. Is the right document to work from?

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Super finance Loan App Customer” Care Helpline Number-:recycling_symbol:(+91∆)- (904•00√03π|676)@! 9040003676-!-! .all-©️- call Call💯✔️

Super finance Loan App Customer” Care Helpline Number-:recycling_symbol🙁+91∆)- (904•00√03π|676)@! 9040003676-!-! .all-©️- call Call💯✔️Super finance Loan App Customer” Care Helpline Number-:recycling_symbol🙁+91∆)- (904•00√03π|676)@! 9040003676-!-! .all-©️- call Call💯✔️Super finance Loan App Customer” Care Helpline Number-:recycling_symbol🙁+91∆)- (904•00√03π|676)@! 9040003676-!-! .all-©️- call Call💯✔️Super finance Loan App Customer” Care Helpline Number-:recycling_symbol🙁+91∆)-...
 
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Why I?

In a few minutes of boredom in a switchroom today we discussed why 'I' is used for current. If you think of Ohms law V & R are pretty obvious but why 'I' for current? If we were discussing inductance I could understand it but that's measured in henrys. So, without cheating and Googling it anyone know the significance of the 'I'? No doubt it's obvious but we couldn't think of it.
Also why couldn't I post this without a prefix????? Had to pick hobby 😕

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Faac c721 shorting power on mains

Hi, I have installed a faac c721 with 4 Photocells and everything we connect the transformer it trips the power in the house. We have tested and we get 250v but cannot understand why it keeps shorting the circuit. The c721 is just sat on driveway can't get around it. Has anyone noticed problems with this before - the transformer could just be a smoke screen it's brand new only a couple of weeks old. Faac have said send it back for testing but that's a nightmare with all the blockwork settled...
 
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