Safety at work is one of those things that is often overlooked for various reasons. Sometimes we just get into a groove and are not thinking about it. Other times, employers can put workers in a potentially dangerous situation by ignoring regulations or insisting employees do things contrary to common sense.
For a broadcast engineer working in the field, safety can be a matter of life and death. Transmitters, in particular, have a host of potential safety issues; high voltage, thermal burns, RF burns, revolving mechanical parts, and external things like lightning. Transmitter sites themselves can be critter magnets, anything from bees to raccoons, bears, and even the two legged kind.
Good general practices can go a great way in reducing injuries and downtime. Take this young fellow here:
First of all, it appears he has gone to work in his pajamas, which is a no-no. Secondly, he has the right idea, wearing safety goggles while undertaking the risky operation of cutting low density polyethylene with a pair of hand shears, however, those look more like swim goggles. They appear to be improperly donned. He is using a right handed shearing device with his left hand and the work area looks cluttered and unkempt.
Seriously, we are all responsible for ourselves. While at work, it is important to use common sense. I may be a wimp, but if I have a question on whether the breaker is on or off, I go check. High voltage power supplies offer no second chances. Here is a list of things to be cognizant of while working at transmitter sites:
- Weather. If the transmitter got knocked off the air by lightning, wait till the storm is over to fix it. It is still coupled to the tower, even if the backup transmitter is on the air.
- Fall hazards. OHSA requires fall protection for any worker working at an elevation higher than 4 feet. Fall protection can vary CFR 29 subpart E 1926 has all the details.
- Falling object hazards. Tower works have been known to drop a wrench from time to time. A hard hat should be required whenever climbers are on the tower. Also, I watched ice shedding from a 1000 foot TV tower practically destroy a fuel delivery truck in a matter of minutes.
- RF safety. I require all tower climbers to wear personal RF alarms when climbing on any tower that has RF radiators active. Do not work in hot ATU’s or Phasors. ATU’s and Phasors should have provisions to make all necessary measurements with protective covers in place and minimally exposed RF parts.
- Electrical safety. Never work alone at a transmitter site. Turn off breakers before opening transmitter doors, do not defeat interlocks, always discharge high voltage with ground stick. Hang ground stick on HV power supply output. Tag out breakers if in a separate room from transmitter.
- Critters. Use bee spray on ATU’s and other outdoor structures. Be careful around wild animals, even mice and mice dropping can spread disease, use hand cleaner after cleaning up mice nests. Snakes love tuning houses, generator sheds or just about any building that is not inhabited.
- Generators and backup power. Generators pose several hazards; fuel and batteries can be explosion risks, revolving parts, thermal burns and high voltage.
- Access to site. Some areas where mountain top transmitter sites are common, access during winter months can be tricky.
Much of this is common sense, remember, a radio station is a radio station, there is only one you.