Your Guardian Angel (1974)

e [Music] [Music] [Music] you hurry for somebody who's supposed to be taking care of the safety of others Harry you don't seem to be doing such a great job when it comes to yourself I'll have to keep a closer eye on you what are you doing here anyway I didn't know you went in for old junk old junk listen everything you see on this table represents an accident what's more it's all 600 volt equipment the kind used in commercial and industrial buildings well I couldn't have picked a better time then Harry do you remember when you first joined our staff do I I really let myself in for something that day [Music] all right Harry nothing's going to hurt you not anymore we've got an important job for you if you're interested I thought my working days were over not yet we need a troubleshooter someone who can guard people who become involved with electricity we think you're the man for the job safety is a NeverEnding Tas we really need someone with your experience and qualifications need me that's a laugh I could have used them you got yourself a man you can start right away you've done such a great job we thought we'd expand your activities to take care of the people who work around higher voltages well take these accidents I'll bet that in most of them there wasn't anything basically wrong with the equipment after all Des to be safe or it wouldn't have the CSA seal of approval but equipment uh like this switch box it can become defective and it's mechanical as well as electrical if it's poorly maintained it becomes worn and dangerous just that much faster under adverse conditions 600 volts will Aron burn just as this one shows misuse sheer misuse looks like it was hit with an arc welder Nearly New too do you know what ionization is I ization oh dear and we covered it in training school too well normally air is a pretty good insulator but when a high voltage Arc occurs air ionizes it changes its composition so that it actually conducts current when that happens the ark continues to burn and grow until there's an explosion or a fire right at least temperatures get so high that components will melt and run all over the place to cause further arcing or it sprays out like the blast from a shotgun I thought it would knock a person flying no not necessarily that's why it's got to be treated with respect Harry you're really a professional that's why you were picked for the job say do you know what a Delta circuit is uh-uh it's a three phas circuit and if you remember many flashes and fires are caused by a ground fault in a three-phase circuit the current for an ungrounded Delta or three-phase circuit is supplied from a three-phase Transformer a voltmeter connected between any phase and ground will read about 347 volts if the circuit is functioning normally in a circuit that is functioning normally the voltage phaseo phase in this case is 600 volts but the voltage from phase to ground due to the capacitive of effect of the conductor is about 347 volts should a ground fault develop in any phase the voltage to ground on that phase will drop to zero and the voltage on the other two phases will rise to 600 volts Delta or 3 wire 600 volt systems are usually used to operate Motors and have different characteristics from star or four wire systems used for six 00 volt lighting where a grounded neutral is necessary often several installations even in separate buildings are fed from a single three-phase Transformer over the same Delta circuit this can sometimes present a problem should a ground fault develop in one building as Illustrated in the previous diagram the building where the fault occurs has a voltage drop to zero on the faulty phase while the remaining buildings experience a rise to 600 volts to ground on the phases not affected by the fault in building d a similar situation can develop in a single building where the service from a three-phase Transformer is used to supply a number of different departments a ground fault in one piece of equipment will again produce zero potential to ground found in the affected phase and cause a rise to 600 volts on the other two phases throughout the entire building the resulting strain imposed upon insulation and other equipment might under certain conditions lead to failure and create a second ground fault this now means that we have a short circuit through the ground which would undoubtedly cause a shutdown of the plant High amperage in the system could now cause extensive damage to equipment and possible injury to operators well that's the story of 600 volts there's your call to action don't worry harry'll do all right hey wait a minute and just what do you think you're doing with that pig tip my job any objections I've got plenty of objections if that's any indication of the way you do your job all you sure are asking for it that's a 600 volt three-phase circuit man you stick this 110 volt thing in there and that bulb will explode faster than you can blink use a volt meter or a ground fault detector for checking the circuit they just for decoration or were you actually going to wear them ah see you don't break all the rules good rated for 750 volts and tested in a lab last month now get yourself a proper voltmeter and we'll check the circuit well looks like it's nothing worse than a blown fuse we'll take care of that in a jippy one of these days maybe they'll put in circuit breakers and I'll be able to tell right away if the circuit's open now what do you think you're doing where's your fuse pullers in the Box well that's a right- handy place for them you sure do ask for it from the look at these Battle Scars I'd say you've been living on bored time for quite a while say how about slipping on those safety glasses you look like you're in pretty good shape say don't forget just stand aside turn your face away when you throw the switch on just in case there's a flash when the circuit picks up the motor starting mode haven't you forgotten something I said haven't you forgotten something no aren't you supposed to check for ground faults before you go ahead with the job oh yeah yeah I guess I forgot everything looks pretty normal yeah without testing I'll show you something else that isn't normal right off the bat this blanket looks like it was left out in the sun folded up instead of rolled in a protective container ozone has caused it to deteriorate oh come on those little cracks shouldn't make all that much difference You're darn right they make all that much difference high voltage electricity can penetrate even a pinhole so every crack in this blanket means that much less protection get yourself another blanket one that's in good shape and been tested recently and a voltmeter well I guess I'm ready to make my tests hey wait a minute what the heck is it now let me see that volt meter now that's okay you'd be surprised how many people take chances by using the wrong tools and equipment what about your eye protection [Music] that's the one switches around the corner uh which one circuit 21 right hold it hold it there what's the matter that switchy open back there is for a 600 volt lighting circuit 600 I thought everything in here was 110 now that's the kind of thinking that can get you into trouble you should always take the right precautions make sure you know the voltage as well as the circuit see 600 volts that's not the kind of system to second guess yeah you're right I should have checked it myself someone thought enough of you to identify and label all the circuit the company's only been here a few months I really don't even know my way around yet man it only takes a fraction of a second for someone to get hurt now all the boxes are clearly marked it only takes a second to check hey look at this never mind about that get me some rubber gloves I'll never get used to traveling this way welcome back Harry you've had a busy day you look like you've had the day off not at all I had to keep an eye on you oh how' I do pretty good Harry you know this equipment was all designed to be safe as long as it was treated in the correct manner right if it's CSA approved it's safe when you follow the correct procedure 600 volt circuits aren't to be fooled with check thoroughly whenever a piece of electrical equipment fails to function before you attempt any repair that's right now you're learning if it's a ground fault and you can't locate the fault in your own building ask the power utility to check other buildings on the same circuit come over here follow a preventive maintenance schedule to ensure that your personal equipment is always in top-notch condition and regular testing should be done by a qualified laboratory always air check your gloves every time you use them and always use the personal safety equipment designed for 600 Volt work use the right tool for the job makeshift and shortcuts are a good way to to join our little group Harry and don't be in a hurry we won't have a vacancy for a long long time and don't forget tell the people you work with not to fool around with 600 volt equipment let the professionals who know how to handle it take care of the problems well Harry you've done such a good job I'm going to let you buy me a Heavenly cup of coffee [Music] he [Music]