Loss Of Electrical Supplies

Question 1

Changeover switches have two positions they are ?

Answer 1

Normal

Alternative

Question 2

Dchq will manage the restoration of electrical supplies by ?

Answer 2

Identifying the necessary changeover switches/ MCCB

Briefing personnel

Ensuring changeover switches/ MCCB are manned

Making warning pipe

Starting another electrical audit when chnageover / MCCB switches are made

Question 3

Hazards of reenergising previously deenergised AC and DC electrical equipment ?

Answer 3

Electric shock

Machinery may start, move or have an undiagnosed fault condition.

Question 4

The electrical audit card has the following info on it ?

Answer 4

Audit number and location

Audit type

A numerical list of electrical equipment or lighting

A tick box if equipment has failed

Name of auditor

Time of audit

Question 5

Who can complete electrical audits and how long do they have to complete them ?

Answer 5

Any one and they have are to be completed within 3 minutes

Question 6

After you have completed an audit what are you to do ?

Answer 6

Return card to DCHQ

If unable to return card to Dchq pass on info via Damage control net or WE net or telephone

Question 7

Dchq documentation allows the WE cell to manage the situation as it hold info on ?

Answer 7

Tiger team personnel

Tiger team location

Closing up checks

MCCB dumps

Fwd changeover switches positions

Spare load centre MCCB

Electrical audit cards

Electrical kill cards

Question 8

How many people in a tiger team and how are they identified ? Who do they always maintain comms with

Answer 8

Always in pairs and they are identified by coloured surcoats/ armbands

Dchq

Question 9

Contents of a tiger teams bag ?

Answer 9

Test equipment and tools

Kill cards and electrical composites

Question 10

Dchq consists of ?

Answer 10

Dco

Me cell - DCMEO
ME mechanical
ME electrical

WE cell - DCWEO
WE sensors
WE weapons

Incident board marker

Comms number

Question 11

Once the cause of an electrical supply loss has been identified it should be isolated from the electrical distribution system to ?

Answer 11

Prevent further loss

Allow the maintainer to investigate

Restore electrical supplies

Question 12

Likely causes of main electrical supply failures

Answer 12

TGs

MSCs

DGs

Main breakers

Load centre breakers

Moulded case circuit breakers (MCCB)

Shore supply

Question 13

MRSs priority in an electrical supply loss ?

Answer 13

Identify the source of the failure and inform command/ DCHQ of the electrical systems status. Also make full main broadcasts to inform fwd of electrical supply losses that they may not notice

Question 14

If sub loses 24V DC supplies what happens ?

Answer 14

Sub is piped to diving stations and systems need to be locally controlled

Question 15

DC failures can be caused by ?

Answer 15

Battery breakers

MSCs

DC DGs

DC shore supply

Loss of main battery

Question 16

Machinery fed by DC supplies ?

Answer 16

HP ballast pump

HP ballast priming pump

Steering and hydroplanes hydraulic pump

EPS

lub oil pumps

Question 17

First indications of an AC supply failure to the crew would be ?

Answer 17

Half or full lighting loss with secondary lighting initiated

Ventilation fans stopping

Equipment indications stop

Pumps and motors stopping

Noises from electrical panels as they de-energise

Question 18

There are many causes of electrical failures SOPs detail the following likely losses ?

Answer 18

Loss of one non essential busbar

Loss of both non essential busbars

Loss of one essential busbar

Loss of same side essential and non essential busbars