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  1. D

    Can anyone recognise how to use this Junction Box

    I collect old Electrical Fittings and I recently acquired this vintage Junction Box (photos attached). I've been trying to figure out how it would have been wired in/used. This Bakelite Junction Box has a Depth of 1¼ inches with an outside Diameter of 2½ inches. Viewed from...
  2. D

    How to measure DC motor field winding resistance?

    Hello, I need to understand whether a DC motor is sturdy or not. The support person told me to measure the armature and field winding resistance. How to measure DC motor field winding resistance? Would you help me with this topic ? I measure the armature connections between both windings as...
  3. M

    How to calculate the current used by a BLDC motor under load?

    I'm working on a robotics project and currently we are designing a battery. This battery is dedicated to the motor driver and two BLDC motors. I want to know how much current the battery will draw if we drive the robot at a certain speed. More specifically, how to calculate the speed of a BLDC...
  4. R

    How to conduct safe isolation on this main switch ?

    Hi all, if I cannot access the line side of a crabtree 100A DP main switch. Would someone enlighten me how to conduct safe isolation on this installation. Would the main fuse need to be removed ? Thankyou.
  5. M

    How to use a Lipo battery to power a carcam

    Hello I am hoping someone can point me in the right direction. I have 4 x new Lipo rechargeable batteries 2900mAh 11.1v (32Wh) 35C constant and 65c discharge bursts (?? pass!). I would like to use them to power a car cam (not being used for a car) which has a micro power connection (like a USB...
  6. L

    How to "Monitor" a RCBO??

    Anyone think of a way for a 'tripped"RCBO to notify property owner etc. Client has a valuable display cabinet thats fed from a RCBO (Radial) . But wants to know if it ever "trips" ? And the cabinet loses power .
  7. M

    How to find the correct replacement transformer for a lightstring.

    Hi all, No electronic knowledge here. The plug/transformer of a led lightstring is fried. Now I am trying to find a replacement on Aliexpress. Since we live in Papua, its the best option. But I cant find one with the same numbers. My fried transformer has: PRI (primary) 220-240V ~ 50Hz...
  8. D

    Hello All, I have Adept TW02W wifi Thermostat - does anyone know how to reset it?

    Hello All, I have Adept TW02W wifi Thermostat - does anyone know how to reset it?
  9. S

    MEGGER Bm223 - how to use it?

    Hey guys As some of you know I'm studying at college and invested in a MEGGER Bm223 just to practice at home. I have a spare 2.5 cable at home to practice on. Does anyone know how to use this device ? Continuity and resistance test ?
  10. G

    How to connect 50 amp inlet box to a Siemens 200 amp outdoor combination panel

    Trying to connect a 50 amp inlet box to my Siemens outdoor combination panel 200 amp cutoffs. Can’t figure out where to insert the 50 amp breaker since the 200 amp breakers appear to cover the whole panel. The panel has two 200 amp breakers, but want to connect it to just one of the panel...
  11. G

    How to connect 50 amp inlet box to Siemens outdoor combination panel

    Trying to connect a 50 amp inlet box to my Siemens outdoor combination panel 200 amp cutoffs. Can’t figure out where to insert the 50 amp breaker since the 200 amp breakers appear to cover the whole panel. The panel has two 200 amp breakers, but want to connect it to just one of the panel...
  12. L

    How to install a junction on ring circuit spur?

    Hi everyone, I've got an electrical ring circuit that looks somewhat like the drawing below, where the blue sockets are part of the main ring and the red socket is a spur. I need to create a new socket, but the closest socket and the only one I have easy access to is the spur. Is there any...
  13. K

    How to desolder in completely easiest by using Hot Air Gun

    I'd recently found very difficuly to remove IC Chip or SMD components from tiny board by using ATTEN AT850 (2 in 1 Hot Air & Soldering rework station), even I switched up to 380 to 450 celcius with airflow in within 3.5 level also yields in nothing. I did attached those picture for those tools...
  14. sakurakey13

    Level 3 Design Project - How to calculate Zs?

    So I’m doing my level 3 design project at the moment, and I’m on the question where you do all the calculations on each circuit, I’ve taken the max earth impedance from the regs, but it’s asking me for the earth fault loop impedance of the circuit. I think it’s asking me to calculate it, and I...
  15. D

    How to test RCD for lighting circuit

    I live in Australia; you can use a socket tester to test the RCD for the power outlet circuit. Plug device to a 3-pin wall socket, set testing mA to 30 on the device and press test button. What is the best way to test RCD on the lighting circuit – from an existing B22 or E27 lamp holder? (Not...
  16. A

    How to do a proper insulation test on an electric motor

    I want to check the insulation of the 3-phase 400VAC asynchronous squirrel cage motor. Motor's stator windings are connected in delta. I've read in some textbooks it is necessary to open motor's junction box and disconnect terminals and remove jumper bars (which are used to establish delta or...
  17. jgy2001

    How to remove this old smoke detector?

    Our Northern California home built on 1977 has a built-in Gard-Site Smoke Detector model 081-612. It does not has battery. Its mounted on the ceiling. We assume its AC hardwired, correct? Its making false alarms. How do we remove it? Thank you very much for your help. It's made by CASADY...
  18. Spike1947

    How to Wire up a aftermarket Rear View Camera

    Hi Re: VW Tiguan 2011Diesel SUV 2.0 TDI FWD -- 5N_ 1968cc 103KW 140HP CFFB vin: WVGZZZ5NZBW063715 Am going try and fit a aftermarket wi-fi rear view camera, question, Where do I fit the feed to the infotainment unit, I think it is a RDC 510 Premium 8 , have ordered a connector as per pic, just...
  19. P

    How to identify if the sunhouse storage heater has asbestos in it ?

    Hi I’ve recently got my first home I’m not entirely sure when they were built I’m thinking possibly 60s or 70s? My problem is the storage heaters as I would like to remove them and change them to something modern, they are sunhouse SSH18A-79352s my main concern upon opening it up to take the...
  20. M

    AFCI keeps tripping - replaced outlet, checked switches - how to choose replacement?

    Our family room is part of an addition built a few years ago. We had an issue with nuisance tripping on an AFCI and the electrician came and replaced it saying the one we had was later found to be faulty. All was fine until I bought a new Denon receiver to replace an older Onkyo. I plugged the...

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