Incorrect hook on hook attachment potentially leading to side loading 
Preferred method with karabiner mated and screwed closed Lanyard Choices: It's Not Simple, It's Understanding - Training is the KEY
There are an abundance of choices in lanyards and brands on the market, single lanyards, twin tail lanyards, rope, webbing, elesticated /stretch lanyards with varying attachment hardware. Double action hooks, Screw gate- Spring gate- triple action karabiners. All of various sizes and lengths giving the electrical industry numerous options and choices to suit specific work tasks.
This has often led to frustration from wrong products being purchased or mismatching hardware being used in a need to get something to comply with attached climbing.
The continuing demand for manufacturers to come up with practical, user friendly, lightweight, multi purpose use lanyards is not as easy as some may think.
Most of the new variations or designs are inputted from end users that actually use the equipment and have a need to have a special product created for their specific work task.
One of the frustrating issues we face as a height safety specialist company, is we cannot control what is being used by whom or how in our industry. What may be right for one work task may be inappropriate for another.
The reality is you cannot get one product that will do all the work and that would eliminate all potential risks when working at heights.
The key is understanding the products being used, as all products have limitations.
Training in the equipment - training in work task.
Life & Rescue Training is the first step to working safely
Some simple tips on lanyard connection use
Hook on Hook Connection is not accepted
(Example) small hook on lanyards being attached to larger hooks at eye connection that do not give free movement or can snag or side ways load.
In a vertical over head situation with limited movement you can control the loading direction of a hook. Used in attached climbing you have no control over the way hooks can move between each other, whilst moving across and up, this can lead to hooks being loaded on gates and sideways from their main axis. There are limited products on the market that can sustain gate loads or side loads. As a rule we do not recommend hook to hook connections. There lies great potential for role out, snagging and overloading that could result in a failure of hardware.
If you are going to use large hooks make sure they are sewn into the lanyard as an integral part or use a secure connector such as locking karabiner or mallion that cannot undo snag or put undue pressure on any part of the attached hardware and gates.
Make sure these products are compatible and can move freely with no risk of snagging. Always check with the manufacturer of products for suitability and compatibility if in doubt.
Side ways loading on hooks is not acceptable: on large hooks on structural steel, make sure hooks cannot get snagged.
If you are using large hooks make sure that they move freely around steel structure and load end to end as intended. Cross or sideways gate loading is to be avoided as can result in failure.
Accessing the work task, preparing with a work method and using specific equipment suited to the task is taking a planned approach.
Our company state representatives can help assist or discuss your on site every day needs and heights requirements.
Written by Gordon Hedges Life Rescue International Pty Ltd Tel:1300 302 111