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not DIY i know fella's but im sure some on here will offer a usefull opinion. been doing some work in an installation. the building is steel beams/guirders and sheeting with gas pipes and water pipes connected throughout and bracketed onto the guirders/ steelwork. in the main switchroom...

hi, the cable is inside a building so outside is not an issue. the joint would have to be vertical.

not strictly DIY but from previous viewing of the forum i know theres some knowledgeable sparks on here. picked up an industrial job which requires joining big swa cable. the current setup is a swa cable (240 4 core,swa as earth) coming up from a duct in the ground (inside building)...

rf, what is cwt?

any ideas how much to expect anyone? got 12 metres of swa cable which i have stripped. it was 4 core x 400mm2!

hi, just a quick question. i need to replace a damaged light switch. the current switch has 2 switches each one switching the live to 2 different lights. there are 2 cables coming in with a live (red) and a switched live (black) in each (as well as earths). there are no markings on the...

hey guys, not strictly DIY but as theres some knowledgable heads on here im sure you'l know. not had any experience with this before so hopefully someone can help. am fitting an rcd 3 phase socket outlet, the outlet is made by menekes and is 32A 4 pin (3 phases and the earth). it...

not strictly DIY but id appreciatte some thoughts as i know there's some good sparks on here. went to look at a job today at a small ish workshop. there was a ring circuit (singles in conduit) feeding 5 sockets around a small workshop. (no rcd protection required). job is a couple of new...

few more questions gents if thats ok 1, ive used xlpe swa so can anyone confirm no need to strip insulation back? can just connect straight to busbar? 2, busbar has 2 pre drilled holes in it (look about 12mm diameter). when i say pre drilled i mean by someone else not the manufacturer. can...

the cable is xlpe so thats fine. have also got to protect the swa in an area where it could possibly be damaged if just clipped direct. there are some overhead cranes so it would be possible but not likely. what is best form of mechanical protection. would heavy cable tray suffice?

guys, cheers, uve been absolute stars on this one. just goes to show you should never be afraid to ask. if anyone knows any good books on 3 phase and three phase calcs id be much obliged if you can pass on the info. could be picking up more 3 phase stuff in he long run so would be good to gen...

the supply is 3x 400A. this goes through a mains isolator (also 400A fuses) and then onto the busbar chamber. fuses are bs88 yeah. havent measured pfc although likely high as the efli is 0.01.

cheers spark123 i know the fuse will take it yeah but was referring to the poles of the switch fuse rated at 100A tp. see what you mean about the fault current on the first few metres of install. the busbar chamber protection is 400A per phase so i might have to rethink this one...

hi guys, thanks for the interest. the system is tn-s. zdb at the busbar chamber is 0.02. my overcurrent device is going to be a bs88's. the welder is currently supplyed by an old 100A switch fuse fitted with 100A bs88's. it is being moved hence the new install. few more...

not strictly diy but am sure someone on here will have the know how. am looking to calculate the volt drop on a 3 phase cable. the cable is wanted to supply a 3 phase welding (no nuetral) machine pulling 80A per phase approx. proposed run is 50 metres. proposed cable is swa pvc 4 core 35mm...

any takers? :lol:

hi is it ok to perform rcd and earth loop test on an rcd socket outlet (spurred from cooker point) that is connected to a board that has 3 ring mains supplying computers and UPS, board has lighting circuits aswell by this i mean, can any damage occur to the computers or UPS by testing what...

hi, not really a DIY question but here goes..... on an industrial build where we are currently doing some work i came across a setup ive not seen before. the main switchroom is right next to a sub station. out of the substation room came 2 big cables (swa 4x300 by the looks of it). These...

cheers for the help guys. im thinking that adam151 n ricicle are right because the layout is as i stated. its a 150KA transformer ricicle. am positive its a +15v terminal spark123, but nice thinking though :wink: ill be correctly protecting the transformer now yes and making sure...

no the 15v is after the 0 terminal. the old machine transformer is disconnected. bits have been robbed off it but apparently it still worked when took out of service so.......