Document ID: chunk:federal_register_of_legislation:F2018L01173:body:0:p57
Version: federal_register_of_legislation:F2018L01173
Segment Type: other
Provision Reference: 
Character Range: 147003–149950

the plan. If contractors are involved, then their agreement is also required.

12.3              Rectifiers and electronic equipment
Working near charged capacitors associated with rectification circuits is hazardous.
Maintenance or repair work should not be attempted until the equipment has been effectively isolated and any stored energy dissipated. Only competent persons should be authorised to repair electronic equipment.

12.4              Radio communication and navigational equipment
Aerials and open wire feeders should be placed and guarded in a way to make them inaccessible to unauthorised persons.
Conductors that pass through areas of high electro-magnetic flux should be insulated or otherwise protected in areas to which seafarers have access.
Seafarers should not be allowed to work near transmitting aerials whilst there is a possibility that they may be energised. Any work in the vicinity of transmitting aerials should be carried out only under the "permit-to-work" system (see section 3.8). Warning notices should be posted at appropriate places until the work has been completed.
Suitable means should be provided and maintained to exclude any persons from the vicinity of equipment where there is a danger from shock, radio frequency burns and injury from X-rays or other radiation.
Notices warning of the danger of high voltage should be displayed near radio transmitter aerials and lead-through insulators.
Where accumulators are used they should be disconnected at source; otherwise control measures should be implemented to prevent short circuiting the accumulator with consequent risk of burns.
Live chassis connected to one side of the mains are usually marked appropriately and should be handled with caution. Where the mains are AC and a transformer is interposed, the chassis is usually connected to the earth side of the supply, but this should be verified using an appropriate meter.
Modern equipment often includes a master crystal enclosed in an oven; the supply to the oven is taken from an independent source and is not disconnected when the transmitter is switched off and the mains switch is off. Mains voltage will be present inside the transmitter, and care should be taken.
Before work is begun on the energy harvesting (EH) section of a transmitter or other EH apparatus, with the mains switched off, all EH capacitors should be discharged using an insulated jumper, inserting a resistor in the circuit to slow the rate of discharge. This precaution should be taken even where the capacitors have permanent discharge resistors fitted.
An electrolytic capacitor that is suspect, or shows blistering, should be replaced since it is liable to explode when electrical supply is on. There is a similar risk when an electrolytic capacitor is discharged by a short circuit.

12.5              Batteries and battery rooms
Particular hazards when charging batteries are hydrogen explosion and short circuits.