Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
Tools
Mains socket and RCD trip tester
I needed to replace a broken mains socket. No problem - that's permitted without needing to employ an accredited professional electrician.
Once completed I had intended to check the connection using my "Martindale" test plug, but alas, it was nowhere to be found. Looking online I found that there was a newer model which also did a Loop Test, and it also checked that an RCD tripped when it should.
However, the coveted EZ365 sells for around £65 which is nearly 5x the cost of the basic model. There were numerous alternatives made in the Far East, but this is a safety-checking tool, and I'm unsure if I could trust a very low-cost unit. Martindale are highly regarded for this technology, and used by a high percentage of electricians.
As I'm starting to investigate off-grid storage and inverters which can deliver 240v AC, what I'd really like is a full domestic circuit check tool. But these are calibrated test-boxes costing £500+. I can't substantiate that expense for the infrequent occasions when I'd use it.
Continuing online research, I came across mains RCD test units made by Uni-T, which I traced back to the manufacturer's own AliExpress shop.
That Model UT582 did what I wanted and cost not much more than the Martindale EZ365 RCD Test Plug. But importing it from China was going to take a couple of months, delayed more than usual due to their current Covid restrictions.
And that's when I found the same item re-badged Multicomp and available next day delivery from CPC, part of the Farnell group of companies. At £90+VAT it was a massive saving on the professional testers, and I didn't need the annual calibration certification anyway.
The Multicomp MP780430 test unit arrives as a kit. It has a pair of black/red probes and two mains-socket test-cables (UK and European). Those socket test-cables normally sell for around £25 each! There's a fabric carry case and a strap to hold the device around your neck whilst working.
It requires six AA-size cells to power it, but those were also included. In time I'll replace them with long-life lithium cells, more appropriate for a safety-check tool which gets used only occasionally.
The CPC kit is a better bundle than was available direct from China, and also comes with the warranty of a reputable British company behind it.
Save energy... recycle electrons!
- 26 Forums
- 2,618 Topics
- 61.1 K Posts
- 746 Online
- 6,994 Members
Join Us!
Worth Watching
Latest Posts
-
Brown Oily Residue Blocking Air Vent and Weeping Relief Valve... Anyone Seen This?
My installation is 4 years old. After about 18 months a...
By seoras , 2 hours ago
-
RE: Renewables & Heat Pumps in the News
An article on funding for heat pumps in case anyone is ...
By Jeff , 3 hours ago
-
RE: Indevolt Batteries UK Support & Info Thread
Thanks @editor , @indevolt-uk Subject to any comments ...
By JamesPa , 11 hours ago
-
RE: Share Your Experiences with Heat Pump Manufacturer Support
@seoras Sorry to hear that. I found Vaillant very help...
By JamesPa , 11 hours ago
-
The Watchdog That Watched and Waited
On 9 January 2026, Consumer Energy Solutions collapsed ...
By Mars , 15 hours ago
-
RE: GSHP Kaput After 16 Years: New Compressor or Switch to ASHP? Advice Welcome
Cool Energy in Grimsby sell ground source heat pumps an...
By DerekDeLeon , 15 hours ago
-
RE: Valliant Heat Pump Settings
Thats arguably a sign of a good installer - they unders...
By JamesPa , 16 hours ago
-
RE: Electricity price predictions
Well, we have so many cases where rain water mixes with...
By Batpred , 17 hours ago
-
RE: Two heating zones to one zone
@profzarkov They arent obviously wrong, but the only...
By JamesPa , 19 hours ago
-
RE: Towns water feed to air source heat pump system
The DHW circuit cant be separated (well it could, you c...
By JamesPa , 19 hours ago
-
Solis AC-coupled 3kW storage inverter
Solis AC-coupled 3kW storage inverterPylontech batterie...
By MartinRobinson , 1 day ago
-
RE: My NIBE ASHP Nightmare: No Commissioning, High Bills and a Hostile Installer
As @transparent has observed above, this is not bad, an...
By cathodeRay , 1 day ago
-
RE: The Grid Says Yes.. Until It Doesn’t: Why Britain's Net Zero Push is Stalling at the Plug Socket
As I was reading this article Mars, I was thinking that...
By Toodles , 2 days ago
-
RE: Tell us about your Solar (PV) setup
Installed in May 2011: 16*Sharp 245 W monocrystalline p...
By txmartyn , 2 days ago
-
-
RE: Say hello and introduce yourself
That doesn't sound 'right' to me. The national Smart ...
By Transparent , 3 days ago
-
RE: Growatt battery disconnected
I doubt this will happen, but I will try and suggest it...
By Eliuccio , 3 days ago
-
Understood. That's why I decided from the outset on a ...
By JamesPa , 4 days ago
-
RE: My experience with 3 heat pump surveys: Heat Geek, British Gas & Octopus
On the litigation, I would not go there and definitely ...
By Batpred , 4 days ago
-
RE: Recommended home battery inverters + regulatory matters - help requested
I suppose if your pv inverter packs up, you have a plan...
By Batpred , 4 days ago
-
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
Firstly check you are using sound power not sound press...
By JamesPa , 4 days ago
-
That’s the solar up and running, I don’t think it’s the...
By David999 , 4 days ago
-
RE: Seeking ideas / information / commiseration - Pure Drive
I agree with @colinc that you can reuse some of it. A s...
By Batpred , 4 days ago







