If you need to load a plugin’s helper in a view or a page;

Plugin name:
Lowercasevendor/exampleplugin

Helper Namespace:

namespace lowercasevendorexamplepluginViewHelper;

Location:
htdocstestcakepluginsLowercasevendorexampleplugin

<?php
//load helper
$this->loadHelper('Lowercasevendor/exampleplugin.My');?>