TB 118 safe electrical isolation of gas appliances. ACS GAS TRAINING. Technical bulletin 118 We've got Andrew from Socket and See and Andrew's going to go over the new technical bulletin, TB 118 and he's going to go over, he's going to show us how to do safe isolation checks. Also, now with the new SES, this is going to be included in the SES as well. So we do need to know how to work safely on boilers. So yeah, I'll pass you over to Andrew now.
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Thanks very much for that, Alan. Andrew here from Socket and See and in this series of videos, we're going to be looking at how easy it is to comply with gas-safe technical bulletin 118, as long as you've got a little bit of know-how and the right equipment. Obviously, technical bulletin 118 covers all these essential electrical checks that a gas engineer will have to carry out when servicing a boiler. The first test we'll carry out is the safe-to-touch test. For this test, we're going to be using the Socket and See SP400 proven unit and the Socket and See VVD pro non-contact voltage detector. The first thing we need to do is prove that the non-contact voltage detector works. Then we do a quick sweep of the boiler, checking the boiler chassis and any extraneous metalwork. Once we've done the check, we prove that the non-contact voltage detector works and we're confident that we've completed an extraneous metalwork checks.

Now I've done the safe-to-touch test. I know that I can touch the boiler. Next is the essential electrical checks, and I need to access the boiler terminals for this. So I've removed the two retaining screws from the front of the boiler. Just pop that off. I have switched the boiler off while I access these terminals. I'll just drop the front, remove the two red retaining screws on this insulating panel, retain them for reassembly of the boiler, then lift this and we've got access to the terminals.

To do the essential electrical checks, I'm going to be using the Socket and See DLM Pro. I can use the magnetic strap to hold it in place on the boiler. I'll then connect the earth, ensuring a nice clean connection. That's very important for the testing. I'll then connect the neutral and the live. And then I'll switch the DLM Pro to the socket position before re-energising the boiler. That gives me my polarity checks and my incoming voltage checks. If any of those aren't right, the DLM Pro won't allow an earth loop impedance test, then simply switch to the loop position. It does a no-trip loop test. So it shouldn't trip the RCD and a healthy installation. Gives me an earth loop impedance reading right back from the transformer to the chassis of the boiler of 0.3 Ms and that's a good indication on the metre. Then disconnection, remove the live, remove the neutral, remove the air, and that's the essential electrical checks completed on the boiler.

Now I've done the essential electrical checks. I'm going to safely isolate the boiler so I can do the servicing on it while it's dead. I've removed the fuse from the fuse spur. I'm going to keep that safe and retain that myself. There are multiple locking off devices that can be used on fuse spurs or plug chops, for instance, the Socket and See log 10. Because I'm totally in control of the boiler, I won't be fitting that. Maybe if it was going to the van to get some tools then I would fit that device. Now I've removed the fuse. I can assume that it's safely isolated, but I want to prove that it's safely isolated. To prove safe isolation, I'm going to be using the Socket and See SP400 proving unit and the Socket and See VIP150 two-pole tester. The first thing we must do is use the SP400 to prove that the two-pole tester works correctly. Once I've proved that throughout the entire range, I can do the checks on the boiler terminals.

I'll be checking from earth to live connecting to the earth first, from neutral to live, connecting to the neutral first, and finally from earth to neutral. And we mustn't have any have indications during any of these checks. Again, we can assume that the boiler is safely isolated, but we've got to prove operation of the VIP150 again. Yeah, I've proved that operates throughout its entire range. We're save to continue with our power-off checks.

Run through the entire TB118 process now, and you've seen how easy it is to comply as long as you've got the right information and the right test equipment. We now are going to take a closer look at the equipment that we use to carry out the process, starting with the Socket and See VVD Pro. It's a non-contact voltage detector that operates from 50 to a thousand volts. And it's ideal for carrying out checks on extraneous metalwork, such as boiler chassis, radiators, pipes, and taps, just to see if there's any voltage present. If it doesn't give an indication, you know it's then safe to touch. It clearly

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