AC Electrified Lines

Question 1

An emergency switch-off is carried out by?

Answer 1

The electrical control operator (ECO) will switch off the electrical supply to all lines between neutral sections, or between a neutral section and the end of an electrified line.

Question 2

OLE stands for?

Answer 2

Overhead Line Equipment. If you are not sure whether the OLE is live, you must treat it as live and dangerous to life.

Question 3

Overhead line permit (known as form C)

Answer 3

signed and issued by the NP and given to a DP, who is to carry out work on or near to the OLE. It states exactly what electrical equipment is isolated and earthed

Question 4

You must treat OLE as being live at all times, unless?

Answer 4

One of the following applies: • An overhead line permit has been issued to the DP. • The OLE has been isolated and earthed and an assurance has been received as shown in local isolation instructions. • The OLE has been made safe to approach, but not touch, by an emergency switch-off and the ECO gives this assurance.

Question 5

Name the OLE construction parts below

Answer 5

1 Catenary wire 2 Dropper 3 Contact wire 4 Headspan wire 5 Cross span wires 6 Structure bond 7 Insulators 8 Mast or structure 9 Structure number plate 10 Along-track conductors

Question 6

You must make sure, you and anything you are carrying are no nearer than what to OLE?

Answer 6

2.75 metres (9 feet)