i am considering the age of this equipment, and my own experience in working and repairing medium and high voltage switches, that only properly qualified people should be designated to rack -in and out these switches. not just electricians --"properly qualified people". this person needs to understand allot more than which way to turn the "rack crank"! just as important ---------- this person must be properly trained and FEEL CONFIDENT in what he is doing!
an example: after hours -- 4000 amp main breaker trips feeding the lighting in a 40 story office building! there are no building engineers on duty at the time --- the building manager finds the breaker "tripped" and reads the instructions "to reset turn clockwise--" and thats as far as he reads! the rest of the instructions explained "to only turn 90 degrees" and "return to the upright position" and "continue this operation until the breaker closes". the manager begins turning the handle and reaches the stop at 90 degrees and the breaker is not closed -- he figures he needs to apply more force on the handle -- and he does -- and it still didn't close -- now, remember he's the manager and his tenants are in the dark --- he gives it all he's got -------snap!---------- he's standing there with the handle in his hand. broke the operating shaft off back inside the switchgear!!!!
i have seen this happen three times, why, "unqualified people"..........
now this is a function that requires zero exposure to possible exposed electrical surfaces.
the training "needed" for the racking in and out switches on medium and high voltage equipment is understanding what to do when THE UNEXPECTED occurs! "most" switchgear is interlocked to prevent racking the switch out without it being in the "opened" position.
an example: two men (that have never racked out a breaker- only watched others) are sent to rack out a breaker feeding a large chiller which required maintainance. their boss doesn't consider there would be a problem since the chiller is already shutdown --if they have a problem they will come back........... there are five chillers -- and they get the chiller numbers mixed up and start opening a chiller that is operating ---- at 1200 amps/480 volts. the interlock rod on the switchgear was misaligned and allowed them to begin racking this energized breaker out under load! neither man had electrical backgrounds, they mechanical guys who were then going to work on the chiller. they knew they had a problem from the noise of the arc --- and stopped racking it out. at this point -- they were panic stricken! they knew they made a mistake! smoke was beginning to come from under the switchboard. they decided to rack the breaker under load back in!! the guy who was originally turning the cranking handle was too shook up to do anything, so the second man stepped up and started turning the crank--------IN THE WRONG DIRECTION !!!!
neither man was seriously injured! it burnt a hole in the back of the switchgear four foot around and placed the chiller out of commision for a month!
it's when the unexpected happens ---- many electricians ---- may not make the correct move or action, but they have a better understanding of the consequences of their actions. this cannot be taught in a classroom overnight!
an example: a "recently overhauled" high voltage (4160 volt) starter was being racked out for the first time. again, the men were mechanical trained and were performing maintainance and inspections on a chiller that the switch controlled. they tripped the switch and it went to the "off" position. as they started to rack the switch out -- a metal bracket swung down from the upper section. both men thought this was wrong -- but didn't say anything to the other -- thinking it would suggest they didn't know what they were doing to the other!!!! they started continuing the rack-out when the bracket came loose and slid into the line side of the gear. both men were burnt -- but luckily lived. the bracket was a support for transporting the gear when it was "overhauled". it was never removed when the gear was re-installed and was only held in place by the fresh paint on the cover plates. perhaps if they considered the results of a twelve inch metal bracket -- loose --- inside a 4160 volt switchgear --------- they would have stopped when it first dropped????
you may be in a serious pi$$ing contest here --"who's incharge?" type thing and management people don't like egg on their face. and my own professional opinion for everyone concerned:
the company
the management
the operators
the electricians
only people(not necessarily electricians) who know the consequences of their actions, and who are trained in the operation including the interlocks and have the ability to check these interlocks to confirm the have fuctioned should be allowed to rack in or out medium or high voltage switches. these people should be confident in this operation prior to attempting it!!!
i have worked in buildings as a contractor -- where management asked their employees to perform tasks beyond their men's ability. some of these tasks i would not do myself nor would i ask my employees to perform. i have gone to their superiors and explained the possible problems that could arise --- most of the time they agreed and changed their policy. one particular engineer refused --"i've done it that way for years and thats the way i want it!". i made an agreement with him --- i would perform this dangerous task he was asking his men to do for "free" ---- because i had a better chance understanding the unexpected ----
an example: change out elevator feeder circuit breakers on an energized distribution panel --- 800amp--480 volt feeder. consider what would happen if the new 250 amp three pole breaker was bad from the factory. and the man didn't consider it --- and never checked the line side "clear" before sliding in place onto an energized bus???? they called me three times --- and i never charged them ---- they then changed their policy and changed them in the early morning hours on a dead bus as i did!!!
everyone should step back -- forget who's gonna win -- use common sense -- consider the costs of the damage caused by an error --- and consider standing before this man's family---------at the funeral........