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Hi Wams, after safe isolation, link L1 and CPC of motor circuit at DB, measure between L1 and CPC at 3 phase socket outlet connected to load end of DOL starter, push in contactor of the DOL with insulated screwdriver to make the contact within the starter. Repeat this using L2 and CPC and L3...

Well done Moggy, what next !!! good luck for the future (MERKAT) ;)

Hi Sidey, 543.4 Combined protective and neutral (PEN) conductors 543.4.1 Pen conductors shall not be used within an installation except as permitted by regulation 543.4.2 Note: In Great Britain, regulation 8(4) of the electricity safety, quality and continuity regulations 2002 prohibits the...

Hi Tim, have a look on you tube, just google you tube and in the search box type, electrical tray installation, or electrical tray fabrication, good luck, (MEERKAT)

Hi John, very interested, I have sent you a PM, cheers, (MEERKAT)

Hi Puthor the scenario fault current is 403.5 Amps 450 Amps will trip fuse in 0.1 Sec's 300 Amps will trip fuse in 0.2 Sec's therefore 403 Amps falls somewhere in between, ie 0.15 Sec's I hope this helps, (MEERKAT)

Hi Puthor, I am not sure about your adiabatic equation answer for scenario one, show your calculation, so we can see how you get 1.569mm everything else checks out fine, (MEERKAT)

Hi Phutor, It is difficult to calculate without full details required, is this a :- TN-C-S Max Zs = 0.35Ω or a TN-S Max Zs = 0.8Ω? Ib = P/V = 1200 (12 x 100w) / 230 = 5.2Amps In = MCB type B = 6Amps It = In/ Correction factors, see page 255 (brb) section 3 no correction factors reqd, so It...

Hi ya Moggy, answer B could well be ESQCR 2002, electricity safety, quality and continuity regulations 2002 (MEERKAT)

thanks Andy, Philbas, for sharing the knowledge, appreciate it (MEERKAT)

thanks Sidewinder, well I never new that, shows you how little I know. I can honestly say, I have learnt so much from you guy's on this forum, far more than I ever did at college, keep up the good work, and thanks once again !!!!! (MEERKAT)

Hi Andy, thanks for the info, only ever connected a 230V coil, could you show me how this would be done using a simple diagram, not had much experience with 400V coils, cheers (MEERKAT)

thanks brian, surely the dol starter requires a neutral at one side of the coil supply end, I thought this connection could be used aswell as a line connection and the cpc connection on the load side to measure Zs, Zs can also be calculated using formula Zs = Ze+(R1+R2) I would go for the...

cheers canoe, just what I was thinking, I know from experience that colleges sometimes use 1.5mm cable instead of 2.5mm cable because of a lack of resources, so using a 5 pin with the neutral not connected fits the bill, but isnt technically correct and may send out the wrong message to...

cheers sidewinder, I think they had a spare 5 pin lying around or somebody ordered the wrong part, just wanted to make sure I hadnt missed a trick somewhere, thanks again (MEERKAT)

thanks sidewinder, the reason I ask is that the rig at my college is fitted with a 5 pin socket, trying to understand why? I appreciate that a normal 3 phase motor does not have a Neutral connection, thanks for your help (MEERKAT)

I am in the process of building a test rig for the 2391, can anyone remember if the DOL circuit socket outlet was a 5 pin (3 phase+N+CPC) or 4 pin (3 phase+CPC) cheers (MEERKAT)

Hi kme, Appendix 1 in the 16th Edition lists BS 4293 : 1983 as "Specification for residual current-operated circuit-breakers". Page 112 identifies BS 4293 as an RCD, @ x1 trip less than 200mS, x5 trip less than 40 mS (MEERKAT)

well done Majoroak congratulations (MEERKAT)

Well done Mark740 How did you find the 2391? Any tips on what to study, and what did you have to do for the practical part of the exam, cheers (MEERKAT) I am hoping to do it next year sometime